Relevant bibliographies by topics / Macro-initiator

Academic literature on the topic 'Macro-initiator'

Author: Grafiati
Published: 22 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Journal articles on the topic "Macro-initiator":

1

Nakamura, Kohki, Keiji Fujimoto, and Haruma Kawaguchi. "Dispersion polymerization of methyl methacrylate using macro-azo-initiator." Colloids and Surfaces A: Physicochemical and Engineering Aspects 153, no. 1-3 (August 1999): 195–201. http://dx.doi.org/10.1016/s0927-7757(98)00531-7.

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Xu, Yuan Qing, Tao Ding, Xiao Min Fang, Hao Xu, and Yan Rong Ren. "Living Radical Polymerization of Methyl Methacrylate Mediated by Tris-(4-Acetyphenyl)Methane." Advanced Materials Research 933 (May 2014): 91–96. http://dx.doi.org/10.4028/www.scientific.net/amr.933.91.

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Pseudo-living radical polymerization and reverse atom transfer radical polymerization (RATRP) of methyl methacrylate (MMA) were reported, utilizing tris-(4-acetyphenyl) methane (TAcPM) as the thermal iniferter and initiator, respectively. The polymerization of MMA using TAcPM as thermal iniferter possesses pseudo-living characteristics: Mnincreases with conversion in a certain range, and the resulted polymer can be used as the macro-initiator for chain extension. The RATRP using TAcPM as the initiator shows linear kinetic plot, linear increase of Mnwith conversion and narrow polydispersity indice (PDI) of the resultant polymers.
3

Xu, Yuan Qing, Xiao Min Fang, Tao Ding, and Yan Rong Ren. "Living Radical Polymerizations of Methyl Methacrylate Mediated by Tris-(4-Carboxyphenyl) Methane." Advanced Materials Research 631-632 (January 2013): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.3.

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Pseudo-living radical polymerization and reverse atom transfer radical polymerization (RATRP) of methyl methacrylate (MMA) were reported, utilizing tris-(4-carboxyphenyl)methane (TCOPM) as the thermal iniferter and initiator, respectively. The polymerization of MMA using TCOPM as thermal iniferter possesses pseudo-living characteristics: Mn increases with conversion in a certain range, and the resulted polymer can be used as the macro-initiator for chain extension. The RATRP using TCOPM as the initiator shows linear kinetic plot, linear increase of Mn with conversion and narrow polydispersity indice (PDI) of the resultant polymers. Effects of temperature on both polymerizations were investigated.
4

Handayani, Aniek S., Is Sulistyati Purwaningsih, Muhamad Chalid, Emil Budianto, and Dedi Priadi. "Synthesis of Amylopectin Macro-Initiator for Graft Copolymerization of Amylopectin-g-Poly(Methyl Methacrylate) by ATRP (Atom Transfer Radical Polymerization)." Materials Science Forum 827 (August 2015): 306–10. http://dx.doi.org/10.4028/www.scientific.net/msf.827.306.

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Graft copolymer of Amylopectin and PMMA was synthesized by atom transfer radical polymerization (ATRP) method. The hydroxyl groups of amylopectin partially substituted with tert-butyl a-bromoisobutyrate to form tert-butyl a-bromoisobutyrate (TBBiB ) groups. This compound is known as an efficient macro-initiator for ATRP process. This research, aimed to obtain a bio based polymer of Amylopectin, in which the amylopectin was used as macro-initiator in the ATRP of MMA. The experiment was carried out in the homogeneous system under temperature range of 40 – 70°C in DMSO solution using TEA as catalyst. The modified amylopectin-TBBiB then was grafted to methyl methacrylate trough ATRP. Product characterization indicates that the graft copolymer Amylopectin-g-PMMA is efficient and the obtained product owns well defined structures
5

Kovačič, Sebastijan, and Christian Slugovc. "Ring-opening Metathesis Polymerisation derived poly(dicyclopentadiene) based materials." Materials Chemistry Frontiers 4, no. 8 (2020): 2235–55. http://dx.doi.org/10.1039/d0qm00296h.

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This review article summarises the academic work in the fields of initiator development, polymer chemistry and physics, composites, self-healing composites, novel processing opportunities and macro-as well as microporous materials.
6

Shen, Shao Hua, Ying Xiang Duan, Qing Quan Liu, and Qiu Guao Xiao. "Preparation and Characterization of Poly (vinylbenzyl chloride)-b-poly (lactide) Copolymers via Nitroxide-Mediated Controlled Radical and Ring-Opening Polymerization." Advanced Materials Research 554-556 (July 2012): 295–98. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.295.

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Hydroxyl-terminated poly(vinylbenzyl chloride) (PVBCOH) were synthesized using nitroxide-mediated controlled radical polymerization. Then, PVBCOH was used as a macro-initiator for ring-opening polymerization of lactide (LA) in the presence of stannous octanoate (Sn(Oct)2) as a catalyst. The structures, molecular weights and polydispersity index (PDI) of PVBCOH and PVBC-b-PLA were characterized by 1H-NMR, and GPC, respectively. The results indicated that PDI of PVBCOH and PVBC-b-PLA was 1.63 and 1.27, respectively. Moreover, the molecular weight and PDI of PVBCOH and PVBC-b-PLA could be well tuned by changing monomer-to-initiator ratio.
7

Chalid, Mochamad, Aniek Sri Handayani, and Emil Budianto. "Functionalization of Starch for Macro-Initiator of Atomic Transfer Radical Polymerization (ATRP)." Advanced Materials Research 1051 (October 2014): 90–94. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.90.

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Using of petro-polymers such as polymethylmethacrylate, polypropylene and polyethylene in the world has been undergoing a critical problem due to significantly decreasing of petroleoum stock as monomer sources. Therefore reducing of the petro-polymer usage should be performed by using natural resources such as modified starches.This study reported addition of an acyl bromide compound to substitute hydroxyl groups on the starch obtains a macro initiator for graft-copolymerizing polymethylmethacrylate (PMMA) onto the functionalized starch as starch-g-PMMA through atomic transfer radical polymerization (ATRP) method. The starch activation through the substitution of the hydroxyl functional group creates ability of the starch to transfer a radical atom onto a petro-monomer such an alkylmethacrylate which furthermore polymerize into starch-g-PMMA at mild condition. This paper reported study of the starch activation describing about screening catalysts and acyl bromide compounds, optimizing process variables such as amount ratio of a selected acyl bromide compound to starch and temperature. The functionalized starchs were analysed by 13-CNMR, FTIR, titration and their morphology was observed by FE-SEM.
8

Liu, Xiaohong, Ming Li, Xuemei Zheng, Elias Retulainen, and Shiyu Fu. "Dual Light- and pH-Responsive Composite of Polyazo-Derivative Grafted Cellulose Nanocrystals." Materials 11, no. 9 (September 14, 2018): 1725. http://dx.doi.org/10.3390/ma11091725.

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As a type of functional group, azo-derivatives are commonly used to synthesize responsive materials. Cellulose nanocrystals (CNCs), prepared by acid hydrolysis of cotton, were dewatered and reacted with 2-bromoisobuturyl bromide to form a macro-initiator, which grafted 6-[4-(4-methoxyphenyl-azo) phenoxy] hexyl methacrylate (MMAZO) via atom transfer radical polymerization. The successful grafting was supported by Fourier transform infrared spectroscopy (FT-IR) and Solid magnetic resonance carbon spectrum (MAS 13C-NMR). The morphology and surface composition of the poly{6-[4-(4-methoxyphenylazo) phenoxy] hexyl methacrylate} (PMMAZO)-grafted CNCs were confirmed with Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The grafting rate on the macro-initiator of CNCs was over 870%, and the polydispersities of branched polymers were narrow. The crystal structure of CNCs did not change after grafting, as determined by X-ray diffraction (XRD). The polymer PMMAZO improved the thermal stability of cellulose nanocrystals, as shown by thermogravimetry analysis (TGA). Then the PMMAZO-grafted CNCs were mixed with polyurethane and casted to form a composite film. The film showed a significant light and pH response, which may be suitable for visual acid-alkali measurement and reversible optical storage.
9

Hazer, Baki, Elif Ayyıldız, and Faruk Bahadır. "Synthesis of PNIPAM–PEG Double Hydrophilic Polymers Using Oleic Acid Macro Peroxide Initiator." Journal of the American Oil Chemists' Society 94, no. 9 (July 19, 2017): 1141–51. http://dx.doi.org/10.1007/s11746-017-3020-0.

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10

Aswale, Suraj, Minji Kim, Dongwoo Kim, Aruna Kumar Mohanty, Heung Bae Jeon, Hong Y. Cho, and Hyun-jong Paik. "Synthesis and Characterization of Spirocyclic Mid-Block Containing Triblock Copolymer." Polymers 15, no. 7 (March 28, 2023): 1677. http://dx.doi.org/10.3390/polym15071677.

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Polymers containing cyclic derivatives are a new class of macromolecular topologies with unique properties. Herein, we report the synthesis of a triblock copolymer containing a spirocyclic mid-block. To achieve this, a spirocyclic polystyrene (cPS) mid-block was first synthesized by atom transfer radical polymerization (ATRP) using a tetra-functional initiator, followed by end-group azidation and a copper (I)-catalyzed azide-alkyne cycloaddition reaction. The resulting functional cPS was purified using liquid chromatography techniques. Following the esterification of cPS, a macro-ATRP initiator was obtained and used to synthesize a poly (methyl methacrylate)-block-cPS-block-poly (methyl methacrylate) (PMMA-b-cPS-b-PMMA) triblock copolymer. This work provides a synthetic strategy for the preparation of a spirocyclic macroinitiator for the ATRP technique and as well as liquid chromatographic techniques for the purification of (spiro) cyclic polymers.
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Journal articles

Dissertations / Theses on the topic "Macro-initiator":

1

Miller, Kent R. "Production of Poly(lactic acid) Biodegradable Films and the Introduction of a Novel Initiation Method for Free Radical Polymerization via Magnetic Fields." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1341862599.

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2

Buchon, Loïc. "Etude de l'auto-assemblage de copolymères à blocs induit par photopolymérisation pour l'impression 3D." Electronic Thesis or Diss., Mulhouse, 2023. https://www.learning-center.uha.fr/.

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Le but de ce travail de thèse a été d’élaborer une résine permettant le procédé PIMS (Polymerization Induced Micro-phase Separation) en photopolymérisation sous l’irradiation des longueurs d’onde du visible, applicable à l’impression 3D et donnant accès à des matériaux thermoplastiques aisément recyclables. Cette thèse s’est donc articulée autour de 3 axes principaux. Tout d’abord, de nouveaux photoamorceurs de Type I, permettant une photopolymérisation efficace sous l’irradiation du visible, ont été développés. Pour ce faire, les propriétés physico-chimiques d’une centaine de composés dérivés des oxydes de phosphines ont été calculées par modélisation moléculaire et les candidats les plus prometteurs ont été synthétisés. L’efficacité de ces nouveaux photoamorceurs a ensuite été évaluée en photopolymérisation et ceux avec les meilleures réactivités ont été utilisés avec succès en impression 3D. Dans une seconde partie, le macro-amorceur Flexibloc, fourni par Arkema, a été introduit dans des résines photosensibles, avec des compositions variées, afin de permettre le procédé PIMS. Différentes stratégies d’amorçages photochimiques ont aussi été étudiées. Néanmoins, en présence du Flexibloc, il n’a pas été possible d’obtenir un copolymère à blocs et le procédé PIMS. Par conséquent, de nouveaux macro-(co)amorceurs, fonctionnalisés avec des amines tertiaires, ont été synthétisés pour remplacer le Flexibloc dans les résines photopolymérisables. Finalement, ces nouveaux composés ont permis une photopolymérisation et une impression 3D efficaces. En outre, grâce à ces nouveaux macro-coamorceurs, il a été possible d’obtenir des copolymères et le procédé PIMS en photopolymérisation
The aim of this thesis was to develop a resin enabling the PIMS process (Polymerization Induced Micro-phase Separation) in photopolymerization under the irradiation of visible lights, applicable to 3D printing and giving access to easily recyclable thermoplastic materials. For this purpose this thesis was structured around 3 main axis. First, new Type I photoinitiators have been developed, enabling efficient photopolymerization under visible light irradiation. For this purpose, the physico-chemical properties of a hundred compounds derived from phosphine oxides were calculated by molecular modeling, and the most promising candidates were synthesized. The efficiency of these new photoinitiators was then evaluated in photopolymerization, and those with the best reactivities were successfully used in 3D printing. In the second part, the Flexibloc macro-initiator, supplied by Arkema, was introduced into photosensitive resins with various compositions to enable the PIMS process. Multiple photochemical initiation strategies have also been studied. However, with the Flexibloc, it was not possible to obtain a block copolymer or the PIMS process. As a result, new macro-(co)initiators, functionalized with tertiary amines, have been synthesized to substitute the Flexibloc in photosensitive resins. Finally, these new compounds enabled efficient photopolymerization and 3D printing. In addition, these new macro-coinitiators made it possible to obtain copolymers and the PIMS process in photopolymerization

Book chapters on the topic "Macro-initiator":

1

Hanifi, Saeed, Farhid Farahmand, and Mohammad Imani. "A Silicone-Based Macro-Initiator for RAFT Polymerization." In Eco-friendly and Smart Polymer Systems, 375–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45085-4_90.

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Conference papers on the topic "Macro-initiator":

1

Eddiyanto, Eddiyanto, Muhammad Ilham, Farah Arfani Daulay, Averroes Fazlur Rahman Piliang, Jhon Darikson Siregar, and Saharman Gea. "The synthesis of macro-initiator using cellulose isolated from OPEFB via atomic transfer radical polymerization method." In THE 7TH INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY (ICST22): Smart innovation research on science and technology for a better life. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0200712.

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