Citation: Da-Wei Shi, Xiang-Ling Lai, Yuan-Ping Jiang, Cong Yan, Zheng-Ying Liu, Wei Yang, Ming-Bo Yang. 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 shu

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

State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China

Corresponding author: Ming-Bo Yang, yangmb@scu.edu.cn
Received Date: 20 August 2018
Revised Date: 25 September 2018
Accepted Date: 1 January 2018
Available Online: 15 November 2018

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 SiO₂ was synthesized as " 3A-PLLA grafting to SiO₂” (GTS), while low grafting density-stretched 3A-PLLA grafted SiO₂ was obtained as " SiO₂ 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-SiO₂ and PLA matrix.
- Poly(lactic acid),
- Nanocomposites,
- Surface grafting,
- Topology,
- Crystallization
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