Preparation and properties of polylactic acid composite modified by bacterial cellulose

被引：0
|
作者：
Chen Q. [1 ]
Zeng W. [1 ]
Shi Y. [1 ]
Wu X. [1 ]
Wang Z. [1 ]
机构：
[1] School of Chemical Engineering and Materials, Tianjin University of Science and Technology, Tianjin
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 03期
基金：
中国国家自然科学基金;
关键词：
bacterial cellulose; grafting; mechanical properties; modification; polylactide; spherulite morphology;
D O I：
10.13801/j.cnki.fhclxb.20220419.007
中图分类号：
学科分类号：
摘要：
Polylactic acid (PLA) is a new green friendly material and has very promising applications. In this work, for effectively resolving the problems of poor toughness and low crystallization rate of PLA, a method of modifying PLA with cellulose was proposed. First, the BC-g-PLA grafting product was obtained by in situ ring opening of L-propyl cross-ester (LLA) using bacterial cellulose (BC) as the substrate, and then the grafting product was added to PLA as a toughening agent, and the composite film material was prepared by the solution casting method. The results show that the reaction efficiency of the solution grafting method is higher than that of the melt grafting method, and the grafting rate can reach 76.60%. Structural testing of the grafted products by FTIR, nuclear magnetic resonance spectrometer and XRD reveal that PLA is successfully grafted onto the BC surface. Polarizing microscopy observed that the spheres have the highest degree of homogeneous refinement when the loading of BC-g-PLA filler as a heterogeneous nucleating agent is 0.6%. It is found through mechanical property tests that the elongation at the break of PLA film can be increased by 175% and tensile strength by 22.7% after toughening and modification. The crystalline properties of the composite film material were tested by differential scanning calorimetry. The crystallinity increases from 2.53% unmodified to 13.26%, and the crystallization rate also increases. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：1430 / 1437
页数：7
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