臺灣博碩士論文加值系統

本研究使用微分掃描熱卡計(DSC)、偏光顯微鏡(POM)、掃描式電子顯微鏡(SEM)、原子力顯微鏡(AFM)以及廣角X光繞射儀(WAXD)來探討兩成份摻合系統poly(ethylene oxide)/low-molecular weight poly(L-lactic acid) (PEO/LMw-PLLA)的相容性以及球晶型態。此兩成份混摻系統，於熔融態呈現均勻相型態，此外，LMw-PLLA的平衡熔點隨PEO加入而下降且作用力參數(��12)為-0.65，證明此摻合系統為一相容系統。
相較於neat LMw-PLLA，當混�洠t統中的PEO含量低於50 wt%時，且結晶溫度為105 oC~135 oC時，LMw-PLLA成長速率增加；然而，當混�洠t統中的PEO含量大於80 wt%時，LMw-PLLA的球晶成長速率則降低。Neat LMw-PLLA於Tc=125~130 oC時會產生具有環狀消光環的球晶(ring-band spherulites)，然而與PEO混摻後，形成環狀帶球晶的溫度範圍為Tc=110~130 oC。由AFM的結果，LMw-PLLA的環狀消光環球晶中的ridge 及valley處，主要分別由edge-on及flat-on的晶板構成。此外，neat LMw-PLLA及PEO/LMw-PLLA系統結晶後，於降溫過程中會產生裂縫(cracks)，而其形貌主要受球晶型態、結晶溫度以及PEO的含量影響。

Miscibility and spherulitic morphology of poly(ethylene oxide)/low-molecular-weight poly(L-lactic acid) (PEO/LMw-PLLA) blends were studied using differential scanning calorimeter (DSC), polarized-light microscopy (POM), scanning electron microscopy (SEM), atomic force microscopy (AFM), and wide-angle X-ray diffractometer (WAXD). The PEO/LMw-PLLA blend is a miscible blend with a interaction parameter (��12) = -0.65.
Compared with the growth rate of neat LMw-PLLA at crystallization temperature 105 oC~135 oC, that of LMw-PLLA in blend system increases with increasing PEO content up to 50 wt% and decreases when PEO content is higher than 80 wt%. Neat LMw-PLLA shows ring-banded spherulites at Tc=125~130 oC, but in the miscible PEO/LMw-PLLA blend, LMw-PLLA shows ring-banded ones at Tc’s (110 ~ 130 oC). In addition, the ring-banded patterns in the blend samples at the same Tc become regular. The AFM characterizations on the ring-banded spherulite of blend show that the ridge and valley regions of ring bands consist of edge-on and flat-on lamellae, respectively. After cooling from Tc to ambient temperature, the cracks are formed in the spherulite, and the crack patterns are influenced by spherulite morphology, crystallization temperature, and PEO content.

中文摘要 I
英文摘要 II
誌謝 III
總目錄
表目錄 V
圖目錄 VI

第一章 簡介 1

第二章 原理 6
2.1 �浀X系統混合熱力學 6
2.2 玻璃相轉移行為 9
2.3 平衡熔點下降 9
2.4 Keith-Padden Theory of Spherulitic Crystallization 11
2.5 球晶成長理論 14
2.6 聚�浀X物的製備 16

第三章 實驗 17
3.1 實驗所用之高分子及試藥 17
3.2 實驗試樣之製備 17
3.3 實驗所用之儀器 18

第四章 結果與討論 21
4-1 �浀X系統之相容性探討 21
4-2分子間作用力分析(平衡熔點分析) 26
4-3 �浀X系統之球晶成長速率分析 34
4-4 球晶型態觀察 37

第五章 結論 60
參考文獻 62

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