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Dissertations / Theses on the topic 'Kinetics of non-isothermal crystallization'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Wang, Shujun. "Liquid-Liquid Phase Separation in an Isorefractive Polethylene Blend Monitored by Crystallization Kinetics and Crystal-Decorated Phase Morphologies." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1226680911.

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2

Failla, Simone. "Crystallization and morphology of the PLLA phase within random poly (L-lactide-ran-ɛ-caprolactone)". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7638/.

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This work has mainly focused on the poly (L-lactide) (PLLA) which is a material for multiple applications with performances comparable to those of petrochemical polymers (PP, PS, PET, etc. ...), readily recyclable and also compostable. However, PLLA has certain shortcomings that limit its applications. It is a brittle, hard polymer with a very low elongation at break, hydrophobic, exhibits low crystallization kinetics and takes a long time to degrade. The properties of PLLA may be modified by copolymerization (random, block, and graft) of L-lactide monomers with other co-monomers. In this thes

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3

Bruna, Escuer Pere. "Microstructural characterization and modelling in primary crystallization." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/6588.

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L'objectiu de la tesi és estudiar la cinètica de les cristal·litzacions primàries en vidres metàl·lics mitjançant simulacions de tipus phase field. Una cristal·lització primària és una transició de fase sòlid-sòlid on la fase que cristal·litza (fase transformada o fase secundaria) té una composició química diferent de la fase precursora (fase no transformada o fase primària).<br/>Les dades experimentals obtingudes a partir de l'estudi calorimètric de cristal·litzacions primàries s'analitzen generalment en el marc del model KJMA (Kolmogorov, Johnson & Mehl, Avrami). Aquest model proporciona l'

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4

Benke-Jacob, Julia [Verfasser], Matthias Akademischer Betreuer] Wuttig, and Joachim [Akademischer Betreuer] [Mayer. "Investigation of the crystallization kinetics in phase-change materials for different structurally non-crystalline phases in a wide time and temperature range / Julia Benke-Jacob ; Matthias Wuttig, Joachim Mayer." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1220082430/34.

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Benke-Jacob, Julia Verfasser], Matthias [Akademischer Betreuer] Wuttig, and Joachim [Akademischer Betreuer] [Mayer. "Investigation of the crystallization kinetics in phase-change materials for different structurally non-crystalline phases in a wide time and temperature range / Julia Benke-Jacob ; Matthias Wuttig, Joachim Mayer." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1220082430/34.

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6

Colonese, André. "Avaliação de propriedades mecânicas e térmicas de compósito à base de polietileno de alta densidade e hidroxiapatita deficiente de cálcio." Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8492.

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No presente trabalho, foram processados compósitos de polietileno de alta densidade (PEAD) com hidroxiapatita deficiente de cálcio (HA), com o objetivo de obter materiais com melhores propriedades mecânicas e bioatividade. A adição da HA deficiente de cálcio proporcionou um aumento no módulo de elasticidade (maior rigidez), menor resistência ao impacto e decréscimo do grau de cristalinidade do PEAD, proporcionando uma maior bioatividade ao material. A análise térmica exploratória (sistema não isotérmico) foi realizada por meio da técnica de calorimetria exploratória diferencial (DSC) e foram a

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7

Červený, Ľuboš. "Kinetika neizotermické krystalizace polylaktidu s přídavkem vybraných činidel." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-444212.

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The aim of submitted diploma thesis is the study of non-isothermal crystallization kinetics of polylactide (PLA) with selected agents (1 %) and observation of the emerging crystalline structure under polarizing optical microscope. The agents were talc, a mixture of organic salts with the addition of amorphous SiO2 (HPN 68L) and zinc stearate (HPN 20E) and LAK-301 (potassium salt of 5-dimethylsulfoisophtalate), which is a nucleating agent developer for PLA. The PLA matrix served as a reference. Non-isothermal crystallization took place on a differential scanning calorimeter at cooling rates ()

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8

Joshi, Sameehan Shrikant. "Non-Isothermal Laser Treatment of Fe-Si-B Metallic Glass." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062821/.

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Metallic glasses possess attractive properties, such as high strength, good corrosion resistance, and superior soft magnetic performance. They also serve as precursors for synthesizing nanocrystalline materials. In addition, a new class of composites having crystalline phases embedded in amorphous matrix is evolving based on selective crystallization of metallic glasses. Therefore, crystallization of metallic glasses and its effects on properties has been a subject of interest. Previous investigations from our research group related to laser assisted crystallization of Fe-Si-B metallic glass (

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9

Anderegg, David Alexander. "In-Situ Monitoring and Simulations of the Non-Isothermal Crystallization of FFF Printed Materials." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/99303.

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This thesis is concerned with the development of methods and models to aid in optimization and development of new materials for Fused Filament Fabrication (FFF). We demonstrate a novel FFF nozzle design to enable the first measurements of in-situ rheology inside FFF nozzles, which is critical for part performance by ensuring that the polymer extrudate is flowing at an appropriate temperature and flow rate during the part build process. Testing was performed using Acrylonitrile butadiene styrene filament and a modified Monoprice Maker Select 3D printer. Tests using the default temperature contr

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10

Ojosipe, B. A. "Non-isothermal kinetics : stability studies of drugs using automated high pressure liquid chromatography." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356435.

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11

El, Kass Moustafa. "Nanocristaux optiquement non linéaires pour des applications en imagerie biologique : synthèse et caractérisations d'iodate de fer en microémulsions." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00678462.

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Le développement de nanomatériaux à propriétés optiques et fonctionnalisés pour un marquage spécifique est en plein essor dans le domaine de l'imagerie biologique. Parmi les agents de contraste exogènes déjà utilisés, les marqueurs fluorescents tels que les nanocristaux semi-conducteurs (CdSe/ZnS,...) et les molécules organiques naturelles (GFP,...) ou synthétiques (fluorescéine,...) souffrent respectivement de clignotements (blinking) et de photo-blanchiment (bleaching) c'est-à-dire d'une faible tenue au rayonnement lumineux incident. Récemment, la microscopie de Génération de Second Harmoniq

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12

Krohe, Christopher W. A. "The Influence of Branching Agent Concentration and Geometry on the Non-Isothermal Crystallization Behavior of Branched Poly(ethylene terephthalate)." Thesis, Lehigh University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10250067.

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<p> Poly(ethylene terephthalate) (PET) is a semi-crystalline polymer that has mechanical and thermal properties suitable for many applications. The rate of crystallization in manufacturing environments influences the final physical, mechanical, and optical properties of PET. Many industrial PET processes occur under dynamic or non-isothermal conditions and in the melt phase. The final material properties are influenced by the size, dimension, and distribution of crystallites and morphology that develop upon cooling from the melt. PET films of varying thickness for optical applications requ

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13

Debnáriková, Michaela. "Krystalizace dvousložkových směsí polylaktidu a jejich morfologie." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-444214.

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Master thesis deals with the influence of polyvinylacetate, polycaprolactone, poly(butylene-adipate-co-terephtalate) and talc, ethylenevinylacetate, polyethylene glycol and monosodium citrate on the flow properties, mechanical properties and crystallization ability of PLA. The flow properties were studied using the melt flow index and mechanical properties were studied using a tensile test. The crystallinity was studied by differential scanning calorimetry and on a polarization optical microscope equipped with hot stage. Isothermal crystallization was performed at 95 and 105 °C for 3 h and non

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14

Al-Sousi, Ghareeb N. "Studies on the thermal decomposition behaviour, kinetics and electrical conductivity of the non-isothermal decomposition of pyridine mono carboxylic acids and some of their transition metal complexes." Thesis, Aston University, 2000. http://publications.aston.ac.uk/9623/.

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The thesis is divided into four chapters. They are: introduction, experimental, results and discussion about the free ligands and results and discussion about the complexes. The First Chapter, the introductory chapter, is a general introduction to the study of solid state reactions. The Second Chapter is devoted to the materials and experimental methods that have been used for carrying out the experiments. The Third Chapter is concerned with the characterisations of free ligands (Picolinic acid, nicotinic acid, and isonicotinic acid) by using elemental analysis, IR spectra, X-ray diffraction,

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15

Yuan, Lina. "La génération de seconde harmonique comme technique complémentaire pour la caractérisation des poudres organiques." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR044/document.

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L'existence de différentes phases, polymorphes, sels, solvates et co-cristaux génère de nombreuses questions concernant la caractérisation des matériaux à l'état solide, en particulier pour l'industrie pharmaceutique. Les problématiques relatives à l'identification des phases et à la surveillance des processus de crist(allisation et de transitions de phase ne peuvent toutefois pas toujours être résolues à l'aide de techniques d'analyse conventionnelles. Dans ce travail, nous développons une approche analytique basée sur le phénomène d'optique non-linéaire de génération de seconde harmonique (G

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16

Sedláček, Zbyněk. "Studium krystalické struktury polyhydroxybutyrátu a nukleační aktivity vybraných typů aditiv." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-240549.

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This diploma thesis deals with study of crystalline structure of polyhydroxybutyrate (PHB), which contains different types of additives for studying of their nucleation activity and which were prepared by mixing. It is about boronitrid (BN), sacharin, hydroxapatit, plasticizer Tegmer a tree types of talc. Crystal structure was analysed by differential scanning calorimetry and x-ray diffraction, supramolecular structure was observed by optical microscopy (polarized and confocal laser scanning). Nucleating activity was evaluated by isothermal and non-isothermal crystallization made on calorimete

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17

Kurakin, Yuriy. "Vliv vybraných činidel na krystalizační schopnost polylaktidu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-433111.

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The influence of seven additives on the crystallization ability of polylactide (PLA), melt flow index (MVR) and mechanical tensile properties was studied. Pressed plates with a thickness of 0.8 mm were tested. Selected additives added in amounts of 0.5 and 1.0% were as follows: talc, sodium benzoate, mixtures of organic salts with amorphous SiO2 and zinc stearate, metal salt, phosphate salt, and potassium salt of 5-dimethylsulfoisophthalate (LAK-301 - nucleating agent developed for PLA). Non-isothermal crystallization measurements were performed at different cooling rates (0.3; 0.5; 0.7; 1.0 a

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18

Ben, Hafsia Khaoula. "Identification des micro-mécanismes de déformation du PET amorphe et semi-cristallin in situ au cours d’un essai mécanique." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0081/document.

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Selon leur formulation et leur mise en forme et grâce à leur complexité microstructurale induite, les polymères thermoplastiques bénéficient d’une grande diversité de propriétés thermomécaniques. Cependant, l’évolution de la microstructure de ces matériaux au cours de leur utilisation reste difficile à identifier. Afin de mieux comprendre les modifications microstructurales ayant lieu au cours de sollicitations thermomécaniques, différentes techniques non destructives de caractérisation en temps réel et in situ ont été développées. Dans ce contexte, un Poly (Ethylène Téréphtalate) (PET) amorph

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19

Lo, Fu-Wei, and 羅富維. "Non-isothermal crystallization kinetics of Irradiated Poly(4-methyl-1-pentene)." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/60929709231448084658.

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碩士<br>國立清華大學<br>材料科學工程學系<br>93<br>We apply gamma ray irradiation from 250 kGy to 1000 kGy on Poly(4-methyl-l-pentene) (commercial name is TPX) specimens in air and oxygen environment. During DSC tests, we set different cooling rates to measure the data of TPX specimens. We proceeded the cooling rate by 1℃、2.5℃、5℃、10℃、20℃、40℃ and 60℃ per minute. The DSC data indicated that the specimens with low gamma-ray dose have large peak which is clear to see, and in high gamma-ray dose the peak become small and not easy to see, especially the specimens irradiated in oxygen environment. In order to proceed

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20

Wang, Chun-Chieh, and 王俊傑. "Non-isothermal Crystallization Kinetics and Melting Behaviors of Poly(butylene succinate) and Poly(trimethylenesuccinate) blends." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/72355726306432489944.

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碩士<br>高雄醫學大學<br>醫藥暨應用化學研究所碩士在職專班<br>96<br>Biodegradable aliphatic polyesters were synthesized by Showa Highpolymer company, trademarked “BIONOLLE”. BIONOLLE is a white crystalline thermoplastic such as poly(butylene succinate), poly(ethylene succinate) and polybutylene succinate adipate copolymer. The mechanical properties of BIONOLLE were similar to that of polyethylene. Avrami and Ozawa equations were used to analyze the experiment data in this study. Because the melting point of PBS is high and the mechanical properties are worse. In addition, the PTS is uncrystallized. Therefore, PBS and P

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21

謝怡帆. "Isothermal crystallization kinetics and crystallization-induced morphological formation in PCL-b-PB/PB homopolymer blends." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/quh28e.

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碩士<br>國立清華大學<br>化學工程學系<br>92<br>The morphology of block copolymer can be tailored by blending with the corresponding homopolymer if the homopolymer is uniformly solubilized in the microdomain. Depending on the molecular weight of the homopolymer, the blend system may exhibit “wet-brush” phase behavior or “dry-brush” phase behavior in the melt. In this report, we study the morphology and crystallization kinetics of a series of wet-brush blends of a symmetric polybutadiene-block-poly( ε -caprolactone) （ PB-b-PCL ） and a low molecular weight homopolymer PB. In the study of melt state morphology,

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22

Lin, Yu-Chien, and 林雨謙. "Non-isothermal crystallization kinetics studies on glass ceramics transformed from coal bottom ash with CaCO3-Na2CO3 additives." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/61820624692867030409.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>96<br>The major electric power supply is thermal power plant in Taiwan, instead of nuclear power plant. It is estimated that above 2,000,000 tons of coal ash was produced annually in Taiwan, the other fly ash of 80% and another bottom ash of 20%. Coal ash has been investigated continuously in the world in order to reduce effect of coal ash on environment. Reuse of fly ash has rather fruitage in ten years, treatment of bottom ash is restricted in landfill, lack of place is produced in the further. Therefore, resource recycle of the bottom ash has become an urgent s

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23

MAO, HSU-I., and 毛栩毅. "Non-isothermal crystallization kinetics and crystal observation of Polybutylene terephthalate/Polytetramethylene Ether Glycol copolymerized thermoplastic polyester elastomer." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8xjf3p.

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碩士<br>國立臺北科技大學<br>分子科學與工程系有機高分子碩士班<br>107<br>This study used various instruments to analyze and identify the properties and crystallization behavior of a series of Polybutylene terephthalate/Polytetramethylene Ether Glycol thermoplastic Polyester Elastomer (TPEE) synthesized in this laboratory. The first part is the identification of components and properties. Firstly, the results of PBT and PTMEG copolymerization were confirmed by FTIR and NMR spectroscopy. The actual peak ratio of PTMEG in each material was calculated from the corresponding characteristic peak area of NMR spectrum. When the

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24

Chang, Yuan-Hsiang, та 張原祥. "Non-isothermal Crystallization Kinetics of Poly(4-Methyl-1-Pentene) Irradiated by γ-ray in Air and Vacuum". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/78281711433073184933.

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碩士<br>國立清華大學<br>材料科學工程學系<br>93<br>Non-isothermal crystallization kinetics of Poly(4-methyl-1-pentene) samples irradiated by γ-ray in air and vacuum with 100-400 kGy was studied using Differential Scanning Calorimeter (DSC). Different cooling rates at 2.5, 5, 7.5, 10, 15 and 20 ℃/min were applied to investigate the exothermic behavior of crystallization. According to the heat flow along the continuous cooling temperature, the heat flow is related to the degree of crystallization. However, we found double peaks in the diagram of the heat flow versus the cooling temperature. Two crystalline proce

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25

Ko, Chi-Yun, and 柯季昀. "Non-isothermal Crystallization Kinetics, Multiple Melting Behaviors and Crystal Structure Simulation of Poly[(ethylene)-co-(trimethylene terephthalate)]s." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/41665322217796796907.

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碩士<br>國立中山大學<br>材料科學研究所<br>91<br>Non-isothermal crystallization of the PET/PTT copolyesters was studied at five different cooling rates over 1-20oC/min by means of differential scanning calorimetry (DSC). Both the Ozawa equation and the modified Avrami equation have been used to analyze the crystallization kinetics. The non-isothermal kinetics of most copolymers cannot be described by the Ozawa analysis, except the copolyester with a composition of 66.3% trimethylene- (TT) and 33.7 %ethylene- terephthalates (ET). It may be due to the inaccuracy of the Ozawa assumptions, such as the secondary c

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26

Tsao, Hsiu-feng, and 曹秀鳳. "Crystallization Kinetics of the Zr61Al7.5 Cu17.5Ni10Si4 Alloy Using Isothermal DSC and TEM Observation." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/65714453289843943579.

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碩士<br>義守大學<br>材料科學與工程學系碩士班<br>93<br>Recently, a number of amorphous alloy systems with a wide supercooled liquid region (ΔTx is above 50 K, ΔTx is defined as the difference between the glass transition temperature Tg and the onset crystallization temperature Tx) and high glass forming ability (have bulk dimensions in the range of 5 to 50 mm) have been discovered. These amorphous alloys promise to allow the production of large-scaled bulk glassy materials by casting at low cooling rates. In addition, availability of these bulk metallic glasses (BMGs) enables unique approaches to form complex-sh

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27

XUE, REN-BO, and 薛任博. "Study on the kinetics of isothermal crystallization and thermal degradation of PLA/Starch blends." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/86947338957883207819.

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碩士<br>高苑科技大學<br>化工與生化工程研究所<br>98<br>The purpose of this research is on the study of thermal degradation and isothermal crystallization of PLA for the neat PLA and the PLA/Starch blends. All the results are based on the combination of characterizations of the Fourier Transform Infrared Spectroscopy (FTIR), the thermogravimetry analyzer (TGA) and the Polarizing Microscope (POM). The FTIR spectra show that there are only physical interactions between the PLA matrix and the starch. The TGA analysis gives that both the thermal degradation reaction and the activation energy of starch are higher that

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Chang, Chih-wei, and 張芷維. "Heat of Fusion, Isothermal Crystallization Kinetics and Morphology of Poly(ethylene-co-trimethylene terephthalate) Copolyesters." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/99679689613996065742.

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碩士<br>國立中山大學<br>材料科學研究所<br>92<br>The crystallization kinetics and the melting behavior of a random copolyester with equal amounts of ethylene- and trimethylene- terephthalate units were studied by using a modulated differential scanning calorimeter in both conventional mode (DSC) and modulated mode (TMDSC). Polarizing light microscope (PLM) was used to study the spherulite growth rates and spherulite patterns. Isothermal crystallization was performed at temperatures (TC) between 115 and 142℃. The Avrami exponents, n1, were found to increase from 3.00 to 3.22 with an increasing TC. At the highe

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NandhoRahmansyah and 南火. "Isothermal and Non-isothermal Crystallization of Poly(ethylene oxide)/Silver Nanoplate Composites." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70743039494496420661.

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碩士<br>國立成功大學<br>化學工程學系碩博士班<br>98<br>This research was accomplished to investigate the effect of the incorporation of silver nanoplates on both the isothermal and non-isothermal crystallization of poly(ethylene oxide) (PEO)/nanoplate composites. In isothermal crystallization of composites, it was obtained that the addition of the nanoplates into the PEO causes an increase in the spherulite growth rate. In addition, the silver nanoplates hinder the primary nucleation of PEO and thus reduce the crystallization rate. This result suggests that silver nanoplates act as an anti-nucleation agent for t

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Liao, Guo-Ting, and 廖國廷. "Thermal Decomposition Kinetics of Polyimide Polymer for Non-isothermal Conditions." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/vx389n.

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碩士<br>大同大學<br>化學工程學系(所)<br>95<br>Studies of non-isothermal decomposition of a new diamine monomer led to a series of novel polyimide polymer (a)-(f) when reacted with six dianhydrides were measured by thermogravimetric analysis (TGA) at a heating rate of 20℃/min in nitrogen and air atmospheres. Three single heating-rate integral methods by Coats-Redfern, Horowitz-Metzger and Van Krevelen that were analysed using the non-isothermal data with different expressions of solid state reactions, i.e., g(a) would be used to estimate the activation energy (E), pre-exponential factor (A), and order of re

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Huang, Ching-Lan, and 黃晴蘭. "Effects of paraffin content on the thermal property, isothermal crystallization kinetic, nanotemplet assemble and morphology behavior of polyethylene-block-poly(ethylene glycol)/paraffin binary blends." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/44202624848000863674.

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碩士<br>崑山科技大學<br>綠色材料研究所<br>98<br>In this work, we provided insights into effect of paraffin content and isothermal temperature on the thermal properties, isothermal crystallization kinetic, nanotemplet assembled and morpholries transition behaviors of polyethylene-block-poly(ethylene glycol)/paraffin (PE-b-PEG/PAF) binary blends by means of differential scanning calorimetry (DSC), wide-angle X-ray diffractions (WAXD), transmission electron microscope (TEM), polarized optical microscopy (POM), and in situ small-angle and wide-angle X-ray scattering (SAXS and WAXS). Herein, the melting temperatu

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