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Relevant bibliographies by topics / Cross-conjugated polymers

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Academic literature on the topic 'Cross-conjugated polymers'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Cross-conjugated polymers"

1

Xia, Hongyan, Chang Hu, Tingkuo Chen, Dan Hu, Muru Zhang, and Kang Xie. "Advances in Conjugated Polymer Lasers." Polymers 11, no. 3 (March 7, 2019): 443. http://dx.doi.org/10.3390/polym11030443.

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This paper provides a review of advances in conjugated polymer lasers. High photoluminescence efficiencies and large stimulated emission cross-sections coupled with wavelength tunability and low-cost manufacturing processes make conjugated polymers ideal laser gain materials. In recent years, conjugated polymer lasers have become an attractive research direction in the field of organic lasers and numerous breakthroughs based on conjugated polymer lasers have been made in the last decade. This paper summarizes the recent progress of the subject of laser processes employing conjugated polymers, with a focus on the photoluminescence principle and excitation radiation mechanism of conjugated polymers. Furthermore, the effect of conjugated polymer structures on the laser threshold is discussed. The most common polymer laser materials are also introduced in detail. Apart from photo-pumped conjugated polymer lasers, a direction for the future development of electro-pumped conjugated polymer lasers is proposed.

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Xie, Ruihao, Zhiming Chen, Yan Liu, Zhenfeng Wang, Zhongxin Chen, Lei Ying, Fei Huang, and Yong Cao. "Cross-conjugated n-type polymer acceptors for efficient all-polymer solar cells." Chemical Communications 54, no. 18 (2018): 2204–7. http://dx.doi.org/10.1039/c7cc09348a.

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Zhang, Zhen, and Yang Qin. "Cross-conjugated poly(selenylene vinylene)s." Polymer Chemistry 10, no. 8 (2019): 1018–25. http://dx.doi.org/10.1039/c8py01555d.

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Poly(selenylene vinylene) (PSV) is a close analog to the extensively studied poly(thienylene vinylene) (PTV) polymers, and possesses unique properties originating from the larger, more polarizable Se atoms.

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Xu, Bubin, Yongchun Pan, Jianheng Zhang, and Zhonghua Peng. "Syntheses and optical properties of conjugated polymers containing cross-conjugated oxadiazole units." Synthetic Metals 114, no. 3 (September 2000): 337–45. http://dx.doi.org/10.1016/s0379-6779(00)00271-x.

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Nakajima, Kuniharu, and Hiromasa Goto. "Preparation of Network π-Conjugated Copolymers with Ullmann Type Polycondensation." International Letters of Chemistry, Physics and Astronomy 25 (January 2014): 33–38. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.25.33.

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Ullmann type polycondensations in the presence of CuI and a base were carried out to afford network type π-conjugated copolymers. Infrared absorption spectroscopy measurements and surface observation using a scanning electron microscopy are carried out. Electron spin resonance spectroscopy measurements revealed that the cross-linked copolymers thus obtained contain small amount of copper. This polymerization conveniently allows production of network π-conjugated polymers. The polymer can be expected to have thermo-resistance.

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Nakajima, Kuniharu, and Hiromasa Goto. "Preparation of Network π-Conjugated Copolymers with Ullmann Type Polycondensation." International Letters of Chemistry, Physics and Astronomy 25 (January 10, 2014): 33–38. http://dx.doi.org/10.56431/p-pmm6t5.

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Ullmann type polycondensations in the presence of CuI and a base were carried out to afford network type π-conjugated copolymers. Infrared absorption spectroscopy measurements and surface observation using a scanning electron microscopy are carried out. Electron spin resonance spectroscopy measurements revealed that the cross-linked copolymers thus obtained contain small amount of copper. This polymerization conveniently allows production of network π-conjugated polymers. The polymer can be expected to have thermo-resistance.

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Sugiyasu, Kazunori, Masayuki Takeuchi, Ryota Inoue, Ryo Shomura, and Yoshitaka Matsushita. "Synthesis and Redox Behavior of a Sheathed Cross-Conjugated Polythiophene." Synlett 29, no. 19 (October 11, 2018): 2557–61. http://dx.doi.org/10.1055/s-0037-1611021.

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Control over the electronic structure in π-conjugated polymers is of great importance for the development of organic electronics and spintronics. In this study, we synthesized a sheathed cross-conjugated polythiophene through oxidative electrochemical polymerization. Spectroelectrochemistry has revealed that unlike linearly conjugated polythiophenes, polarons were confined in the repeating units that were segmented by cross-conjugation.

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Cheng, Yen-Ju, and Tien-Yau Luh. "Synthesizing optoelectronic heteroaromatic conjugated polymers by cross-coupling reactions." Journal of Organometallic Chemistry 689, no. 24 (November 2004): 4137–48. http://dx.doi.org/10.1016/j.jorganchem.2004.08.011.

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Yamamoto, Takakazu. "Cross-coupling reactions for preparation of π-conjugated polymers." Journal of Organometallic Chemistry 653, no. 1-2 (July 2002): 195–99. http://dx.doi.org/10.1016/s0022-328x(02)01261-5.

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Gao, Xin, Qirui Zhang, Jianfeng Hu, and Hao Zhang. "Ferrocene-containing cross-conjugated polymers synthesized by palladium-catalyzed cross-coupling polymerization." Polymer 207 (October 2020): 122827. http://dx.doi.org/10.1016/j.polymer.2020.122827.

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Dissertations / Theses on the topic "Cross-conjugated polymers"

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Elmalem, Einat. "Synthesis of π-conjugated polymers via Suzuki cross-coupling polymerization." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608242.

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Qiu, Yunyan. "Diversifying Catalysts, Monomers, Cross-Coupling Strategies and functional Groups in the Controlled Synthesis of Conjugated Polymers." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/1043.

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The ability to precisely incorporate monomers into polymeric materials grants polymer chemists access to a variety of complex architectures. These materials are commonly prepared by living chain-growth polymerization techniques which have revolutionized the field of polymer synthesis. Catalyst-transfer polycondensation (CTP) is one of those chain-growth methods to afford well-defined conjugated polymers. Serving as active components in most of optoelectronic devices, conjugated polymers prepared by CTP exhibit improved device performance due to uniform polymeric structures. Some promising features CTP can provide include control over size and microstructure, good chain end fidelity and the construction of sophisticated polymeric frameworks with functionality. The frontier of CTP research now focuses on (a) understanding the exact mechanism, (b) monomer scope expansion by rational design of catalysts and conjugated monomers, and (c) obtaining conjugated materials with structural diversity. This dissertation details some of our endeavor towards diversifying the choice of catalysts, monomers, cross-coupling reactions and functional groups available in CTP process.

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Ayuso, Carrillo Josue. "Low cost, more efficient, and less toxic synthetic routes to conjugated polymers." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/low-cost-more-efficient-and-less-toxic-synthetic-routes-to-conjugated-polymers(ee15f7a0-39da-46e8-b512-ff3fb33e4f06).html.

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As key components of flexible organic electronics, the synthesis of polythiophenes via less toxic and more cost-effective routes is demanded. An efficient synthetic route for the production of thienyl-containing homopolymers and copolymers has been developed. The synthetic approach consists of: i) the synthesis in high yield and high purity of thienyl borane monomers protected with N-methyliminodiacetic acid (MIDA) via C-H electrophilic borylation. This reaction uses a combination of inexpensive reagents BCl3, AlCl3, and 2,6-dichloropyridine (Cl2Py) for the regioselective electrophilic aromatic substitution of thiophenes, followed by addition of a second aprotic amine pre-esterification to reduce the Brønsted acidity of the reaction mixture. In situ esterification provided the desired thienyl MIDA boronateester monomers in one-pot at room temperature. ii) Subsequent Suzuki-Miyaura polymerisation of the synthesised monomers to produce well defined thienyl containing pie-conjugated polymers in high molecular weight and high yields. Key reaction parameters for successful Suzuki-Miyaura polymerisation of thienyl-derived MIDA boronate esters under mild temperatures (i.e., 55 °C in THF) were found: a) an optimal monomer:H2O:base ratio, which enables controlled hydrolysis of the BMIDA moiety into its corresponding boronic acid at appropriate rates for high fidelity polymerisation. b) Nature of the base, where K3PO4 provided the best results for production of homopolymers (e.g., rr-P3HT), or KOH which gave excellent results for the formation of copolymers across a range of electronically different comonomers (e.g., pCPDT-BT). Thus, it is demonstrated that the approach is a general strategy for the highly efficient production of thienyl containing pie-conjugated regioregular, regiosymmetric and Donor-Acceptor polymers.

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Wilson, James Norbert. "Phenyleneethynylenes: Structure, Morphology and Photophysical Properties of Novel Pi Systems." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4926.

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The syntheses of novel poly(paraphenyleneethynylene)s, PPEs, and poly(aryleneeethynylene)s, PAEs, as well as hybrid poly(paraphenyleneethynylene)- poly(paraphenylenevinylene)s, PPE-PPVs, are presented. Fluorescent PPEs decorated with biologically relevant ligands are utilized in model biosensing schemes. PPE-PPV hybrids, as well as their highly emissive oligomeric, cruciform model compounds are studied in an effort to modify the bandgap of the parent PPE backbone. Improved hole and electron injection capabilities are demonstrated with these hybrid conjugated materials. Structural variation and morphological effects of PPEs, PPE-PPVs and model compounds are studied to elucidate the effects upon the photophysical properties of the emissive materials.

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Janakiraman, Umamaheswari. "Analysis of electrogenerated chemiluminescence of PPV type conducting polymers." Doctoral thesis, [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968755305.

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Awada, Hussein. "Elaboration des matériaux hybrides, organiques/ oxydes métalliques pour le photovoltaique organique." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3016/document.

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The performance and life time of organic solar cells are critically dependent on the properties of active layer materials and device interfaces. In this manuscript, we developed new organic-inorganic hybrid materials to create intimate contact between donor and acceptor phases and facilitate the interfacial electronic charge transfer through the device. First, the synthesis of versatile triethoxysilane-terminated poly(3-hexylthiophene) P3HT for direct anchoring (grafting-onto) in one step procedure to various metallic oxides was reported. Electro-optical analysis showed an efficient charge transfer from the polymer to nanoparticles; suggesting that these materials are suitable candidates for photovoltaic application. In the second part, we demonstrate for the first time the elaboration of low band gap polymer brushes on metallic oxide surfaces via surface initiated step growth polymerization (grafting-through). In both cases, a higher grafting density, better packing of polymer chains and enhanced optical properties were observed due to the grafting methodology and polymer characteristics. Finally, P3HT brushes were elaborated on indium tin oxide surface (ITO) as hole transporting layer of organic solar cells. Photovoltaic performances showed that P3HT self-assembled monolayer (SAMs) could be promising alternatives to PEDOT:PSS
Les performances et la durée de vie des cellules solaires organiques sont fortement dépendantes de la qualité des matériaux de la couche active et des interfaces dans le dispositif. Dans ce manuscrit, nous avons développé des nouveaux matériaux hybrides organiques-inorganiques pour favoriser le contact entre les matériaux donneur/accepteur d’électrons et ainsi faciliter le transfert de charges à travers le dispositif. Tout d'abord, la synthèse de poly(3-hexylthiophène) P3HT fonctionnalisé par le triéthoxysilane a permis le greffage direct (« grafting-onto ») sur des oxydes métalliques. L’analyse des propriétés électro-optiques montre un transfert de charge efficace du polymère aux nanoparticules; ce qui suggère que ces matériaux sont des candidats potentiels pour l'application photovoltaïque. Dans la deuxième partie, nous avons montré pour la première fois, l’élaboration de brosses de polymères dits à faible bande interdite sur des surfaces d’oxydes métalliques par la technique « grafting-through ». Une densité de greffage élevée, un meilleur empilement des chaines de polymères et des propriétés optiques améliorées ont été obtenus grâce à la technique de greffage et aux caractéristiques du polymère greffé. Enfin, des brosses de P3HT ont été élaborées sur la surface d’oxyde d'indium et d’étain (ITO) en tant que couche de transport de trous de cellules solaires organiques. Les performances photovoltaïques ont montré que les monocouches auto-assemblées de P3HT (SAM) peuvent être une alternative au PEDOT: PSS

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Chen, Wei-yu, and 陳威宇. "Synthesis and Photovoltaic Properties of Maleimide Containing Cross-linked Conjugated Polymers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/85569088200102796394.

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碩士
雲林科技大學
化學工程與材料工程研究所
98
A series of crosslinkable maleimide/thiophene based conjugated polymers with different contents of hydroxyl group containing side chains have been synthesized by the Suzuki coupling reaction. The crosslinkable maleimide/thiophene based conjugated polymers (TM2C41, TM2C21, TM6C41, TM6C21) were reaction with 3,3''-dimethyl-4, 4''-biphenylene diisocyanate by thermal crosslinked in solution state to formed cross-linked polymers (STM2C41, STM2C21, STM6C41, STM6C21), and cross-linked in film solid state to formed cross-linked polymers (FTM2C41, FTM2C21, FTM6C41, FTM6C21), respectively. The chemical structures and crosslinking degree of the maleimide/thiophene based conjugated polymers were identified by the 1H-NMR spectroscopy. The solubility, thermal stability, optical properties, electrochemical properties, and surface morphology of polymer thin films were also studied in the work. Excellent thermal stability was observed for maleimide/thiophene based crosslinked polymers. Polymer solar cells (PSCs) were fabricated from the blends of the conjugated polymer and fullerene derivative (PCBM). The PSCs based on the solution state crosslinked polymers (STM2C41, STM2C21, STM6C41, STM6C21) exhibited power conversion efficiencies of 0.115, 0.118, 0.047, 0.072 %, respectively. The solid state crosslinked polymers (FTM2C41, FTM2C21, FTM6C41, FTM6C21) exhibited power conversion efficiencies of 0.051, 0.050, 0.038, 0.042 %, respectively. As compared to the linear polymer based PSCs, the crosslinked polymer based PSCs show a better operational stability due to the rigid imide rings in the backbone and high morphology stability of the photo-active layer.

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Chen, Ting-Chih, and 陳亭芝. "Synthesis of Cross-Conjugated and Low Band-Gap Polymers and Their Applications in Organic Solar Cells." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/41644673702408432302.

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碩士
國立交通大學
應用化學研究所
98
In recent years, polymer solar cells (PSCs) have been attracting considerable attention for many advantages, such as low cost, light weight, easy fabrication and their potential application in large area flexible devices. Since the discovery of the photovoltaic effect in bulk heterojunction (BHJ) devices, the considerable publications in PSCs have been reported. PSCs based on the concept of bulk heterojunction (BHJ) configuration where an active layer comprises of a p-type donor (conjugated polymer) and an n-type acceptor (fullerene derivative) materials, represents the most useful strategy to maximize the internal donor-acceptor interface area allowing for efficient charge separation. The goal of this research is to design and synthesize a series of new p-type conjugated polymers to achieve highly efficient BHJ solar cells. Six new cross-conjugated and low bad-gap copolymers have been synthesized and characterized. These of three-component donor-acceptor random copolymers are symbolized as (thiophene donor)m-(thiophene acceptor)n. The PCSTBT series are prepared by Stille coupling polymerization of 2,5-bis(trimethylstannyl)thiophene D1 with 1,4-dibromo-2,5-{bis(4-[N,N-(dioctylamino)styryl])}-benzene) D2 and4,7-dibromo-1,2,3-benzothiadiazole A1, while PCSTDPP series are prepared by Stille coupling polymerization of 2,5-bis(trimethylstannyl)thiophene D1 with1,4-dibromo-2,5-{bis(4-[N,N-(dioctylamino)styryl])}-benzene) D2 and3,6-di(2-bromothien-5-yl)-2,5-dioctylpyrrolo[3,4-c]pyrrole-1,4-dione A2. Thesynthesized copolymers are soluble in common organic solvents and possess good thermal stability. The UV-vis absorption spectra of these copolymers contain an intramolecular charge transfer (ICT) transition band, which lead to an absorption extending into near-infrared region and optical band gaps ranging from 1.36 eV to 1.75 eV. Polymer solar cells of a BHJ were fabricated with the structure of ITO/PEDOT:PSS/Copolymer:PCBM(1:2, w/w)/Ca/Al. The PCE were 0.10 % (PCSTBT25), 0.18 % (PCSTBT50), 0.32 % (PCSTBT75), 0.37 % (PCSTDPP25), 0.54 % (PCSTDPP50), 0.62 % (PCSTDPP75). The higher PCE for PCSTDPP75 copolymer solar cell is attributed to the low band gap of this copolymer compared to others, which increases the numbers of photogenerated excitons and corresponding photocurrent of device. Although their PCE is still relatively low, further improvement on device performance can be achieved through morphology control by thermal annealing and chemical annealing, and carefully device engineering.

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Faukner, Tomáš. "Iontové polymery a polymerní sítě polyacetylenického typu připravené metodou kvaternizační polymerizace." Doctoral thesis, 2016. http://www.nusl.cz/ntk/nusl-353396.

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(Doctoral Thesis, 2016, Mgr. Tomáš Faukner, IONIC POLYACETYLENE TYPE POLYMERS AND POLYMER NETWORKS BY CATALYST FREE QUATERNIZATION POLYMERIZATION) The composition and structure of a series of ionic π-conjugated poly(monosubstituted acetylene)s prepared via catalyst-free quaternization polymerization (QP) of 2-ethynylpyridine (2EP) activated with equimolar amount of alkyl halide [RX = ethyl bromide, ethyl iodide, nonyl bromide and haxadecyl (cetyl) bromide] as a quaternizing agent (QA) have been studied in detail. The performed QPs gave ionic polymers well soluble in polar solvents, with approximately half of pyridine rings quaternized, which implies that also non-quaternized monomers were involved in the process of QP. The configurational structure of polyacetylene main chains was suggested based on 1 H NMR, IR as well as Raman (SERS) spectral methods. The QPs in bulk gave more expected irregular cis/trans polymers while the QPs in acetonitrile solution gave high-cis polymers. A series of prepared symmetrical bi-pyridylacetylene based monomers has been polymerized via QP approach resulting into a series of new ionic π-conjugated poly(disubstituted acetylene) type materials. It is therefore obvious that the mechanism of quaternization activation frequently applied on monosubstituted...

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Conference papers on the topic "Cross-conjugated polymers"

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Wallikewitz, Bodo, Matthias de la Rosa, Dirk Hertel, Klaus Meerholz, Aurelie Falcou, and Heinrich Becker. "Amplified Spontaneous Emission of Cross-linkable Conjugated Polymers." In Frontiers in Optics. Washington, D.C.: OSA, 2005. http://dx.doi.org/10.1364/fio.2005.stua2.

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Blanchard, G. J., and J. P. Heritage. "Picosecond Stimulated Raman Measurement of Enhanced Optical Nonlinearities in a Conjugated Polymer." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.tha4.

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Conjugated polymers are of fundamental interest because they are model 1-dimensional semiconductors. They are also attractive candidate materials for nonlinear optical signal processing applications,[1] [2] [3] and they differ from 2-D III-V materials in one important way. The cross-sections of ground state fundamental vibration-to-exciton transitions are large for conjugated polymers, whereas they are typically small for III-Vs. The phonon-mediated nonlinear responses of each of these systems is determined by how strongly their phonons are coupled to the exciton resonance.

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Wone, T. K. S., Y. L. Lam, Y. C. Chan, X. Hu, and H. Liu. "Ultraviolet Laser Lithography of Conjugated Polythiophene Thin Films." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthh79.

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The lithographic patterning of conjugated polymer thin films is important for both device applications such as light emitting diodes and for microlithography. Previous patterning methods which include selective photoelectrochemical deposition and scanning electrochemical microscopy were limited by either the small size of the pattern or the need for photoconductive substrates. In this presentation, we demonstrate that conjugated polymers from the polythiophene series can be patterned directly (without resist) by using the 325nm ultraviolet (UV) radiation from a helium cadmium (He-Cd) laser. These results are an extension of the previous work by Abdou et al [1] and Hu et al [2] on laser irradiation effects on the polythiophenes. Four polymers: polythiophene (PTh), poly (3-methylthiophene) (P3MT), poly (3-butylthiophene) (P3BT) and poly (3-hexylthiophene) (P3HT) were prepared. Both PTh and P3MT were deposited electrochemicallv onto indium tin oxide (ITO) coated glass substrates. The substituted polythiophenes, P3BT and P3HT were synthesized chemically by Grignard coupling and oxidative polymerisation and were dissolved in chloroform to form dilute solutions. Thin films of P3BT and P3HT about 100nm thick were obtained by the dip coating technique. Lithographic patterning was performed using a custom-built UV laser writing system. The He-Cd laser has an output power of 15mW and the power intensity at focus is 286kWcm−2. After line patterns were written, the samples were observed by optical microscopy and atomic force microscopy (AFM). It was found that at sufficiently high incident fluences, all four polymers can be ablated directly into grooves several microns wide and up to 500µm long. The groove widths generally changed slightly with fluence but decreased rapidly near the respective cutoff fluences where no grooves could be formed (Fig. 1). At fluences below about 105 Wem−2, cross-linking was observed in both P3BT and P3HT Films. This renders the irradiated areas insoluble in chloroform and after development in this solvent, line structures 1-6µm wide were found on the glass substrate. Some of these line structures had rippled sidewalls and were attributed to solvent infusion effects. The significance of the present results is that both positive and negative tone lithographic patterning have been demonstrated. The ablation of PTh and P3MT in particular overcomes the difficulty of patterning these insoluble and infusible polymers. The mechanisms of the observed patterning processes will be explained and the linewidth trends shown in Fig.1 and other experiments will be discussed. This direct-write process should have potential applications in polythiophene based devices and conductive resists.

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Marin-Beloqui, Jose Manuel, Kealan Fallon, Hugo Bronstein, and Tracey Clarke. "Donor and Acceptor Character in a Cross-Conjugated Polymer: a Transient Absorption Spectroscopy Study." In 10th International Conference on Hybrid and Organic Photovoltaics. Valencia: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.hopv.2018.124.

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Illera Perozo, Danny, Humberto Gómez Vega, and Julian Yepes Martínez. "Synthesis and Characterization of Conjugated-Polymer/Graphene/Nanodiamond Nanocomposite for Electrochemical Energy Storage." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51982.

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The synthesis and characterization of Polyaniline/Graphene/ Nanodiamond Nanocomposite is reported. The resulting materials were synthetized following a polymerization in situ scheme and characterized by Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetry (TGA), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) and Cyclic Voltammetry (CV). The effect of different loads of graphene and nanodiamond on the resulting nanocomposite was studied. Despite the presence of the host materials, the formation of Polyaniline polymer is successfully accomplished for all samples. The microstructure of the resulting materials is core-shell type with the additives being covered (core) by layers of the conjugated polymer (shell). The thermal stability of the nanocomposites is improved as confirmed by measuring an increase on the Temperature of Decomposition and the Cross-Linking Temperature compared to bare polymer. Electrochemical characterization reveals that the presence of the additives does not affect the electroactive behaviour of the matrix polymer allowing it to reversely shift from different oxidation stages. The effect of additive content on the charge transfer kinetics is discussed.

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ANILAL, ASHISH, JUSTIN BENDESKY, SEHEE JEONG, STEPHANIE S. LEE, and MICHAEL BOZLAR. "EFFECTS OF GRAPHENE ON TWISTING OF HIGH DENSITY POLYETHYLENE." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36468.

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High density polyethylene (HDPE) is known to form banded spherulites when crystallized from the melt. In such spherulites, concentric bands of alternating light and dark colors emanating from the spherulite nucleation center are observable between cross polarizers and appear as a function of the anisotropy of the dielectric susceptibility as crystal orientations continuously rotate about the growth direction. Recently, we identified PE to be a promising compound to induce twisting in conjugated carbonaceous systems, such as triisopropylsilylethynyl anthradithiophene (TIPS ADT). When blended together in ratios between 10 – 70 wt.% PE, TIPS ADT and PE crystals twist in concert with one another to form composite films of intertwined helicoidal fibrils. In this work, we investigate crystal twisting in HDPE-graphene oxide composites. In addition to its unique multifunctionality, graphene has also recently demonstrated peculiar twisting capabilities that strongly alter its physical properties. Here, we first produce graphene sheets through the chemical oxidation of natural graphite, and then investigate the influence of graphene on the twisting of HDPE composites under various processing parameters (graphene concentration, polymer cooling rate, etc). HDPE-graphene composites have been prepared using melt extrusion in the form of microfibers and films. We measured the influence of twisting on the mechanical and electrical properties of the composites, as well as the crystallographic structure using optical and electron microscopy, and X-Ray diffraction spectroscopy.

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