Effect of Poly-Dimethylsiloxane Blocks on Thermal Properties, Mechanical Properties and Gas Permeability of Polylactic Acid

被引：0
|
作者：
Yun X. [1 ]
Lu H. [1 ]
Hu J. [1 ]
Zhang J. [1 ]
Dong T. [1 ]
机构：
[1] College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2020年 / 36卷 / 02期
关键词：
Gas permeability; Mechanical properties; Modified atmosphere packaging; Poly-dimethylsiloxane; Polylactic acid; Thermal properties;
D O I：
10.16865/j.cnki.1000-7555.2020.0033
中图分类号：
学科分类号：
摘要：
PLLA-PDMS-PLLA (PLDLx) triblock copolymers were synthesized by ring-opening polymerization of lactide with hydroxy-terminated poly-dimethylsiloxane (PDMS) as initiator to improve the flexibility and gas permeability of polylactic acid (PLLA) for fresh-keeping packaging of vegetables. The mechanical properties, gas permeation and permselectivity of the films were controlled by the ratios of PDMS blocks. The structure, composition and molecular weight of the copolymers were characterized by 1H-NMR, gel permeation chromatography (GPC), total reflectance Fourier transformed infrared (ATR-FT-IR) and modulated differential scanning calorimeter (MDSC). The thermal properties, gas barrier properties and mechanical properties of the films were investigated. The results show that with the introduction of PDMS blocks, the crystallinity of PLLA is reduced. However, the flexibility of PLLA is significantly increased and the elongation at break is increased 2.5 times; the CO2, O2 permeability and permselectivity of the films are improved; the water vapor transmission rate is decreased slightly with the increase of the hydrophobic PDMS segment contents. Finally, the modificated material was used for atmosphere packaging of vegetables and can extend the shelflife to 18 d. © 2020, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：147 / 154
页数：7
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