Synthesis of Inorganic Silica Grafted Three-arm PLLA and Their Behaviors for PLA Matrix

Da-Wei Shi; Xiang-Ling Lai; Yuan-Ping Jiang; Cong Yan; Zheng-Ying Liu; Wei Yang; Ming-Bo Yang

doi:10.1007/s10118-019-2191-6

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Synthesis of Inorganic Silica Grafted Three-arm PLLA and Their Behaviors for PLA Matrix

ARTICLE | Updated：2021-02-18

- Synthesis of Inorganic Silica Grafted Three-arm PLLA and Their Behaviors for PLA Matrix
- Synthesis of Inorganic Silica Grafted Three-arm PLLA and Their Behaviors for PLA Matrix
- Chinese Journal of Polymer Science 2019年37卷第3期页码：216-226
- Affiliations：
  
  State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  yangmb@scu.edu.cn
- Funds：
  
  The authors sincerely acknowledge the financial support of the National Natural Science Foundation of China (Nos. 51721091, 21674069, and 21174092).
- DOI：10.1007/s10118-019-2191-6
  中图分类号：
- 收稿：2018-08-20，
  
  修回：2018-9-25，
  
  录用：2018-9-25，
  
  网络首发：2018-11-15，
  
  纸质出版：2019-03
- Accepted：
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Citation: Shi, D. W.; Lai, X. L.; Jiang, Y. P.; Yan, C.; Liu, Z. Y.; Yang, W.; Yang, M. B. Synthesis of inorganic silica grafted three-arm PLLA and their behaviors for PLA matrix. Chinese J. Polym. Sci. 2019, 37, 216–226

Da-Wei Shi, Xiang-Ling Lai, Yuan-Ping Jiang, et al. Synthesis of Inorganic Silica Grafted Three-arm PLLA and Their Behaviors for PLA Matrix[J]. Chinese Journal of Polymer Science, 2019, 37(3): 216-226.
Citation: Shi, D. W.; Lai, X. L.; Jiang, Y. P.; Yan, C.; Liu, Z. Y.; Yang, W.; Yang, M. B. Synthesis of inorganic silica grafted three-arm PLLA and their behaviors for PLA matrix. Chinese J. Polym. Sci. 2019, 37, 216–226 DOI： 10.1007/s10118-019-2191-6.

Da-Wei Shi, Xiang-Ling Lai, Yuan-Ping Jiang, et al. Synthesis of Inorganic Silica Grafted Three-arm PLLA and Their Behaviors for PLA Matrix[J]. Chinese Journal of Polymer Science, 2019, 37(3): 216-226. DOI： 10.1007/s10118-019-2191-6.

摘要

Abstract

The low melt strength and poor crystallization behavior severely limit the processing and application of poly(lactic acid) (PLA) as biodegradable film materials. In this work

three-arm poly(L-lactic acid) (3A-PLLA) grafted silica nanoparticles with two kinds of topology structures were introduced into PLA matrix to improve the biodegradation performance. Different methods were used to characterize the structure of the grafted 3A-PLLA chains

the grafting density

and the thermal decomposition behavior of the nanoparticles. By varying the mass ratios of raw materials and altering the order of dropping solution in the reaction

high grafting density-tangled 3A-PLLA grafted SiO

was synthesized as " 3A-PLLA grafting to SiO

” (GTS)

while low grafting density-stretched 3A-PLLA grafted SiO

was obtained as " SiO

grafting to 3A-PLLA” (GTA). Topology of nanoparticles as well as the filler-matrix interaction is critically important to structure bio-nanocomposites with desirable properties. Thus

the GTS and GTA nanoparticles were introduced into PLA matrix to assess the effect. The SEM images showed the uniform dispersion of the modified nanoparticles

while the shear rheology results revealed that GTA nanoparticles made a more significant contribution on the melt-strengthening and relaxation time-extension of PLA. Moreover

it is suggested that GTA nanoparticles were more effective to act as a nucleating agent for PLA

which was proved by differential scanning calorimetry (DSC) and polarized optical microscopy (POM) researches. All of the improvements mentioned above of GTA nanocomposites can be ascribed to stronger entanglements between 3A-PLLA stretched by nano-SiO

and PLA matrix.

关键词

Keywords

references

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