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題名 | 二氧化鈦對聚對苯二甲酸丁二酯結晶與熱裂解行為之影響=The Effect of Titanium Dioxide on Crystallization and Thermal Degradation Behaviors of Polybutylene Terephthalate |
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作者 | 石天威; 羅志明; 陳宏隆; Shyr, T. W.; Lo, C. M.; Chen, H. L.; |
期刊 | 紡織綜合研究期刊 |
出版日期 | 20060700 |
卷期 | 16:3 民95.07 |
頁次 | 頁25-31 |
分類號 | 440.34 |
語文 | chi |
關鍵詞 | 奈米二氧化鈦; 聚對苯二甲酸丁二酯; 結晶動力學; 裂解動力學; Nano-TiO2; Polybutylene terephthalate; Crystallization kinetics; Degradation kinetics; |
中文摘要 | 本文為對苯二甲酸與1, 4-丁二酯於聚合反應加入奈米級與微米級二氧化鈦(Titanium Dioxide TiO2),探討TiO2,對聚對苯二甲酸丁二酯 (Polybutylene terephthalate,PBT) 之結晶與熱裂解行為的影響。實驗中以微差掃描熱分析儀 (Differential Scanning Calorimetry),分析在非等溫結晶條件下之結晶與熔融行為,並計算Modified Avrami指數n值、結晶速率常數(k’)和半結晶期(t’□)。以熱量分析儀 (Thermogravimetric Analyzer) 觀察試樣之熱裂解行為,並藉由Doyle-Ozawa積分法計算裂解活化能 (Ea)。在晶體結構方面,利用廣角X光繞射儀 (Wide Angle X-ray Diffractometer) 觀察其晶面結構,並以加熱式偏光顯微鏡 (Hot Stage Polarizing Microscope) 觀察試樣之結晶形態。結果顯示,在DSC和HSPM及結晶動力學分析發現TiO2,在PBT中可能扮演成核劑的角色,但TiO2,的加入並未改變PBT中的結晶結構與熱裂解反應。 |
英文摘要 | In this study was investigated the effect of titanium dioxide on crystallization and thermal degradation behaviors of three polybutylene terephthalate samples which were synthesized from 1,4-butanediol, and dimethyl terephthalate; 1,4-butanediol, dimethyl terephthalate with macro-TiO2; 1,4-butanediol, dimethyl terephthalate with nano-TiO2, The thermal properties were analyzed by differential scanning calorimetry and thermogravimetric analyzer, Non-isothermal crystallization kinetic and degradation activation energy were calculated by the modified Avrami equation and the Doyle-Ozawa integral method, respectively. Crystallization structure was studied with a wide angle X-ray diffractometer. Crystallization morphology was observed with a hot stage polarizing microscope. Results showed that the peak of crystallization temperature and the crystallization rate constant lie in the order: PBT-N> PBT-M > PBT, but the crystallization half-time lies in the order: PBT> PBT-M > PBT-N. The observations from HSPM found that the number of spherulite in PBT-M and PBτN are higher than that in PBT, but the spherulite size of PBT-M and PBT-N are smaller than PBT. We suggest that TiO2 can act as nuclei. WAXS curve, melting temperature, the degradation activation energy, and crystalline morphology of pure PBT, PBT-M, and PBT-N samples have no significant change. |
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