Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes
碩士 === 國立成功大學 === 化學工程研究所 === 85 === The crystalline, morphology, crystallization kinetics and induced changes of two syndiotactic polystyrene-based blends (s-PS/a-PS and s-PS/PPO) were studied and determined. s-PS presents a very complex polymorphic morphologies, with four different crystalline...
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ndltd-TW-085NCKU30630182015-10-13T12:18:06Z http://ndltd.ncl.edu.tw/handle/97960476338047387081 Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes 對聚苯乙烯(s-PS):之微觀晶形,形態,結晶動力及誘導變化 吳福生 碩士 國立成功大學 化學工程研究所 85 The crystalline, morphology, crystallization kinetics and induced changes of two syndiotactic polystyrene-based blends (s-PS/a-PS and s-PS/PPO) were studied and determined. s-PS presents a very complex polymorphic morphologies, with four different crystalline forms identified so far. The structure and morphology of s-PS and its blends were investigated using wide angle X-ray scattering diffractometer (WAXD) and differential scanning calorimetry (DSC); The literature shows that a mixture of the α、β and β' form is present in pure s-PS annealed sample. The relative intensities of these forms changed with the crystallization temperature(Tc), with Tc above 250℃ that favoring the attainment of the β form . Blending s-PS with PPO or a-PS was to found to favor the P form in these blends. The DSC melting curve also indicated same results, whuch shows one endotherm peak of a form and two endotherm peaks of f3 form. Isothermal spherulitic growth rates of s-PS and its blends with a-PS or PPO were determined over a range of crystallization temperature using polarized-light microscopy and a hot stage. The spherulite growth rate of s-PS decreased as the PPO(or a-PS) volume fraction was increased. The Avrami equation was used to analyse the data of the bulk kinetics of crystallization. The values of the Avrami index (n) range between 2∼3. indicating mixed crystallization and nucleation mechanisms. The Avrami rate constants (k) decreased with increasing crystallization temperature. 吳逸謨 1997 學位論文 ; thesis 104 zh-TW |
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碩士 === 國立成功大學 === 化學工程研究所 === 85 ===
The crystalline, morphology, crystallization kinetics and induced changes of two syndiotactic polystyrene-based blends (s-PS/a-PS and s-PS/PPO) were studied and determined. s-PS presents a very complex polymorphic morphologies, with four different crystalline forms identified so far. The structure and morphology of s-PS and its blends were investigated using wide angle X-ray scattering diffractometer (WAXD) and differential scanning calorimetry (DSC); The literature shows that a mixture of the α、β and β' form is present in pure s-PS annealed sample. The relative intensities of these forms changed with the crystallization temperature(Tc), with Tc above 250℃ that favoring the attainment of the β form . Blending s-PS with PPO or a-PS was to found to favor the P form in these blends. The DSC melting curve also indicated same results, whuch shows one endotherm peak of a form and two endotherm peaks of f3 form. Isothermal spherulitic growth rates of s-PS and its blends with a-PS or PPO were determined over a range of crystallization temperature using polarized-light microscopy and a hot stage. The spherulite growth rate of s-PS decreased as the PPO(or a-PS) volume fraction was increased. The Avrami equation was used to analyse the data of the bulk kinetics of crystallization. The values of the Avrami index (n) range between 2∼3. indicating mixed crystallization and nucleation mechanisms. The Avrami rate constants (k) decreased with increasing crystallization temperature.
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吳逸謨 |
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吳逸謨 吳福生 |
author |
吳福生 |
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吳福生 Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes |
author_sort |
吳福生 |
title |
Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes |
title_short |
Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes |
title_full |
Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes |
title_fullStr |
Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes |
title_full_unstemmed |
Syndiotactic Polystyrene: Crystals, Morphology, Crystallization Kinetics and Induced Changes |
title_sort |
syndiotactic polystyrene: crystals, morphology, crystallization kinetics and induced changes |
publishDate |
1997 |
url |
http://ndltd.ncl.edu.tw/handle/97960476338047387081 |
work_keys_str_mv |
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1716857245346562048 |