Enhanced Crystallization Kinetics of PLLA by Ethoxycarbonyl Ionic Liquid Modified Graphene
Enhanced Crystallization Kinetics of PLLA by Ethoxycarbonyl Ionic Liquid Modified Graphene
复制标题
DOI：
10.1007/s10118-019-2192-5
复制
发表时间：
2018-11
影响因子：
4.3
通讯作者：
Pei Xu;Zhaopei Cui;G. Ruan;Yunsheng Ding
中科院分区：
文献类型：
--
作者：
Pei Xu;Zhaopei Cui;G. Ruan;Yunsheng Ding
为了研究乙氧羰基离子液体（IL）改性石墨烯（Gra）的性能、聚l -乳酸（PLLA）的链迁移率和结晶动力学，采用溶液浇铸法制备了一系列聚l -乳酸纳米复合材料。IL可以改善Gra在PLLA基体中的分散，含有IL的样品比纯PLLA有更高的球晶生长速率。PLLA/IL/Gra和PLLA/2Gra表现出相同的α n弛豫强度和时间，对应于110 ~ 140℃时最长的正态运动。PLLA/IL/Gra的结晶速率比PLLA/2Gra快，这可能是由于IL修饰的Gra中存在Gra-咪唑阳离子相互作用，IL在Gra表面的分散作用显著，PLLA/IL/Gra的核密度增加所致。
To investigate the performance of graphene (Gra) modified with ethoxycarbonyl ionic liquid (IL), chain mobility and crystallization kinetics of poly(L-lactic acid) (PLLA), a series of PLLA nanocomposites have been prepared using solution-cast method. IL can improve the dispersion of Gra in PLLA matrix and the samples containing IL have higher growth rate of PLLA spherulite than neat PLLA does. PLLA/IL/Gra and PLLA/2Gra exhibit the same relaxation strength and time of αNrelaxation that corresponds to the longest normal mode motion at 110−140 °C. PLLA/IL/Gra shows a faster crystallization rate than PLLA/2Gra does, which might be attributed to the Gra-imidazolium cation interaction in IL modified Gra, the significant dispersion effect of IL at Gra surface, and the increase of nuclei density of PLLA/IL/Gra.