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聚乳酸立体复合微晶在聚（丙交酯）/聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯）共混物中的引入，用于制备固态和微孔共混物。

Introduction of stereocomplex crystallites of PLA for the solid and microcellular poly(lactide)/poly(butylene adipate--terephthalate) blends.

作者信息

Shi Xuetao, Qin Jianbin, Wang Long, Ren Liucheng, Rong Fan, Li Daiheng, Wang Ryan, Zhang Guangcheng

机构信息

Department of Applied Chemistry, School of Science, Northwestern Polytechnical University Xi'an China

Total Corbion PLA BV Room 903-905, 9/F Hongkong Plaza, No.283 Huaihai (M) Road Shanghai 200021 China.

出版信息

RSC Adv. 2018 Mar 27;8(22):11850-11861. doi: 10.1039/c8ra01570h. eCollection 2018 Mar 26.

DOI:10.1039/c8ra01570h
PMID:35539374
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9079314/
Abstract

Solid and microcellular poly(l-lactide)/poly(butylene adipate--terephthalate) (PLLA/PBAT) blends with or without poly(d-lactide) (PDLA) were prepared melt blending and batch foaming process with supercritical carbon dioxide, respectively. The introduction of PDLA on the rheological properties, crystallization behavior and dynamic mechanical properties of the PLLA matrix were investigated. The formed PLA stereocomplex between PLLA and PDLA enhanced the storage modulus and complex viscosity of PLLA/PBAT blends efficiently. Interestingly, the addition of 5 wt% or 10 wt% PDLA in the PLLA/PBAT blends was unfavorable for the PLLA crystallization behavior. The potential reason can be sc-PLA crystallites acting as the physical crosslinking points, which constrained the molecular mobility of the PLLA matrix and even blocked the nucleating effect of PBAT domains. Both the enhanced melt strength and decreased crystallinity of the PLLA matrix are favorable for the cell nucleation and growth and the gas adsorption, respectively. The designed partially foaming of PLLA/PBAT with or without PDLA was carried out to investigate the foaming mechanism. The final cell morphology of PLLA/PBAT foams exhibited typical open-cell structure mainly attributed to the soft immiscible PBAT phase as separated domains. With further addition of PDLA in the PLLA/PBAT blends, the microcellular morphology exhibited decreased average cell size and increased cell density. The sc-PLA crystallites networks in the PLLA matrix acted as cell nucleating agents, which meanwhile resisted the force of cell growth and then prevented the cell collapse.

摘要

通过熔融共混和超临界二氧化碳间歇发泡工艺分别制备了含或不含聚（d-丙交酯）（PDLA）的固态和微孔聚（l-丙交酯）/聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯）（PLLA/PBAT）共混物。研究了PDLA的引入对PLLA基体流变性能、结晶行为和动态力学性能的影响。PLLA和PDLA之间形成的聚乳酸立体复合物有效地提高了PLLA/PBAT共混物的储能模量和复数粘度。有趣的是，在PLLA/PBAT共混物中添加5 wt%或10 wt%的PDLA不利于PLLA的结晶行为。潜在原因可能是sc-PLA微晶作为物理交联点，限制了PLLA基体的分子流动性，甚至阻碍了PBAT域的成核作用。PLLA基体熔体强度的提高和结晶度的降低分别有利于泡孔成核生长和气体吸附。对含或不含PDLA的PLLA/PBAT进行了部分发泡设计，以研究发泡机理。PLLA/PBAT泡沫的最终泡孔形态呈现出典型的开孔结构，这主要归因于作为分离相域的软不相容PBAT相。随着PDLA在PLLA/PBAT共混物中的进一步添加，微孔形态表现出平均泡孔尺寸减小和泡孔密度增加。PLLA基体中的sc-PLA微晶网络作为泡孔成核剂，同时抵抗泡孔生长的力，从而防止泡孔塌陷。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2553/9079314/01ce91360fcf/c8ra01570h-f9.jpg
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