文献类型：期刊文献

英文题名：Flexibly Controlling the Polycrystallinity and Improving the Foaming Behavior of Polylactic Acid via Three Strategies

作者：Liu, Wei Wu, Xian Chen, Xiaocheng Liu, Shan Zhang, Chun

第一作者：刘卫

通信作者：Zhang, C[1]|[14440f6a6d277849ce3bf]张纯;

机构：[1]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2022

卷号：7

期号：7

起止页码：1-13

外文期刊名：ACS OMEGA

收录：;Scopus(收录号：2-s2.0-85125069372);WOS:【SCI-EXPANDED(收录号:WOS:000769957200001)】；

基金：We acknowledge the support from the National Natural Science Foundation of China (52163011, 51863003), the research Program of Talented Scholars of Guizhou Institute of Technology (XJGC20190657), and the Academic Novice Cultivation and Innovation Exploration Project (GZLGXM22) of Guizhou Provincial Science and Technology Department. We are thankful for some experimental works of Weiya Zhu and Xiaoqiong Cheng.

语种：英文

摘要：Controlling foamability plays the central role in preparing PLA foams with high performances. To achieve this, chain extension was often used to improve the rheological property of PLA resins; however, despite the availability of this approach, it often deteriorates the biodegradability of PLA and greatly increases the processing cost and complexity. Hence, we reported a special crystallization induction method to design PLA foams with a tunable cellular structure and a high expansion ratio. A novel crystallization-promoting agent combination (D-sorbitol, CO2, and phenylphosphonic acid zinc salt) was used to induce PLA to enhance the chain interaction force and chain mobility and to provide crystallization templets. A series of PLAs with tunable stereocomplex (Sc)/a crystallinity and rapid non-isothermal crystallization ability were obtained. The effect of various crystallization properties on the foaming behavior of PLA was studied. The results demonstrated that proper crystallization conditions (a small spherulite size, a crystallinity of 6%, and rapid crystallization ability) could virtually contribute to the optimized cellular structure with the highest cell density of 4.36 x 10(6) cell/cm(3). When the Sc crystallinity was above 10%, PLA had a superior foamability, which thereby resulted in a high foaming expansion ratio of 16.2. A variety of cellular morphologies of PLA foams could be obtained by changing the foaming temperature and the crystallization property. The proposed crystallization-induced approach provided a useful method for controlling the cellular structure and the performances of the PLA foams.