Blends of aliphatic polyesters.: Part 7.: Effects of poly(L-lactide-co-ε-caprolactone) on morphology, structure, crystallization, and physical properties of blends of poly(L-lactide) and poly(ε-caprolactone)
Blends of aliphatic polyesters.: Part 7.: Effects of poly(L-lactide-co-ε-caprolactone) on morphology, structure, crystallization, and physical properties of blends of poly(L-lactide) and poly(ε-caprolactone)
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DOI：
10.1002/pi.1093
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发表时间：
2003-02-01
影响因子：
3.2
通讯作者：
Itsuno, S
中科院分区：
文献类型：
--
作者：
Tsuji, H;Yamada, T;Itsuno, S
采用溶液浇铸法制备了聚（L)-丙交酯[即聚（L)-乳酸）]（PLLA）和聚（epsilon-己内酯）（PCL）不加或掺加10wt%聚(L)-丙交酯-共epsilon-己内酯）（pla - cl）的共混膜。利用偏光显微镜、扫描电镜、差示扫描量热法和拉伸试验研究了pla - cl对薄膜形貌、相结构、结晶和力学性能的影响。pla - cl的加入降低了PLLA和PCL共混膜中球晶的数量密度，提高了球晶的可观测性和PLLA/PCL共混膜的截面平整度。添加PLLA- cl后，薄膜中PLLA和PCL的熔融温度（T-m）保持不变，而在PLLA含量[X-PLLA= PLLA的质量/（PLLA和PCL的质量）]为0.4 ~ 0.7及大部分X-PLLA值时，PLLA和PCL的结晶度均有所提高。pla - cl的加入使薄膜的拉伸强度和杨氏模量分别提高到0.5 ~ 0.8、0 ~ 0.1和0.5 ~ 0.8，并提高了所有X-PLLA值下薄膜的断裂伸长率。这些结果强烈表明pla - cl与PLLA和PCL具有混溶性，并且溶解在富PLLA和富pll相中的pla - cl增加了这两相之间的相容性。(C) 2003年化学工业学会。
Blended films of poly((L)-lactide) [ie poly((L)-lactic acid)] (PLLA) and poly(epsilon-caprolactone) (PCL) without or mixed with 10wt% poly((L)-lactide-co-epsilon-caprolactone) (PLLA-CL) were prepared by solution-casting. The effects of PLLA-CL on the morphology, phase structure, crystallization, and mechanical properties of films have been investigated using polarization optical microscopy, scanning electron microscopy, differential scanning calorimetry and tensile testing. Addition of PLLA-CL decreased number densities of spherulites in PLLA and PCL films, and improved the observability of spherulites and the smoothness of cross-section of the PLLA/PCL blend film. The melting temperatures (T-m) of PLLA and PCL in the films remained unchanged upon addition of PLLA-CL, while the crystallinities of PLLA and PCL increased at PLLA contents [X-PLLA=weight of PLLA/(weight of PLLA and PCL)] of 0.4-0.7 and at most of the X-PLLA values, respectively. The addition of PLLA-CL improved the tensile strength and the Young modulus of the films at X-PLLA of 0.5-0.8 and of 0-0.1 and 0.5-0.8, respectively, and the elongation at break of the films at all the X-PLLA values. These findings strongly suggest that PLLA-CL was miscible with PLLA and PCL, and that the dissolved PLLA-CL in PLLA-rich and PCL-rich phases increased the compatibility between these two phases. (C) 2003 Society of Chemical Industry.