聚乳酸/聚對苯二甲酸丙二酯/聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯融熔摻混對相容性及結晶性的影響

The Effect on Miscibility and Crystallization of PLA/PTT/SEBS by melt blending

陳建宏(Chien-Hung Chen)

指導教授 ： 程耀毅

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2010年)

摘要

本實驗利用有機環保高分子左旋聚乳酸(PLLA)以及新型紡織高分子材料聚對苯二甲酸丙二酯(PTT)和熱塑性彈性體聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯(SEBS)，以熔融混煉的方式混成含有不同比例之摻混物。利用微分熱卡掃瞄計，來分析聚乳酸(PLA)/聚對苯二甲酸丙二酯(PTT)掺合體之等溫與非等溫結晶動力學。非等溫實驗中可看出PLA隨著SEBS的加入Tg往低溫移動;在等溫結晶學方面，我們在選定的溫度範圍190~210℃內，實驗中可發現SEBS的加入使PTT結晶速率變慢，並利用Avrami方程式來描述等溫結晶動力學。熱重損失分析儀(TGA)觀察到隨著PTT與SEBS的增加，其PLA熱殘餘量與裂解溫度也隨之提高。
在形態學方面，我們利用電子掃描顯微鏡(SEM)觀察摻合體相容性，並用偏光顯微鏡(POM)來觀察PTT加入SEBS後融熔結晶的改變。在機械性質部份，PLA富含相中隨著SEBS的加入拉升長度上升；PTT富含相中隨著SEBS的加入抗張強度下降但拉升長度上升。

關鍵字

聚乳酸 ； 聚對苯二甲酸丙二酯 ； 聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯 ； 等溫結晶動力學

並列摘要

In this study, organic environmental polymer (PLLA) and new-type textile polymer (PTT) and thermoplastic elastomer (SEBS) were melt-mixed in brabender. The isothermal and nonisothermal crystallization behavior of Poly(L-lactic acid) (PLA) and Poly(Trimethylene Terephthalate) (PTT) blends were investigated with differential scanning calorimetry (DSC). Differential scanning calorimetry (DSC) nonisothermal experiment showed that PLA glass temperature were shift to low temperature when SEBS was added. In isothermal crystallization, the Avrami equation was applied to describe the kinetics of the crystallization in the temperature range of 190~200℃. From isothermal-crystallization analysis, the crystallization rate of PTT were decrease when SEBS was added. Thermal gravimetric (TGA) result showed that the residue of PLA and weight loss temperature was improved with the increase of PTT and SEBS.
We also used scanning electron microscopy (SEM) to observe miscibility of each blend, and used polarized-light microscopy (POM) to observe the melt crystallization of PTT after addition of SEBS. In PLA-rich blend, elongation was increased by adding SEBS. In PTT-rich blend, tensile strength was decreased, but elongation was increased when SEBS was added.

並列關鍵字

PTT ； PLLA ； SEBS ； Isothermal Crystallization Kinetics

參考文獻

[32] 溫禮鴻；聚丙烯/聚對苯二甲酸丙二酯摻合體之相容性及結晶行為研究，國立台北科技大學有機高分子研究所碩士論文(2005)。

[33] 溫家坤；聚乳酸/聚對苯二甲酸丙二酯摻合體之相容性及結晶行為研究，國立台北科技大學有機高分子研究所碩士論文(2007)。

[2] Polymer Degradation and Stability 95 (2010) 116-125(2009).

[4] Materials Chemistry and Physics 78 (2002) 416–424(2003).

[7] S.T. Hwang, H.M. Soliman and R.T. Lahey Jr, 439-458(1988).