Thermal Degradability and Stability of Poly (lactic acid)

Biao WANG; Tong WAN; Wei ZENG

doi:10.14028/j.cnki.1003-3726.2015.07.008

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Thermal Degradability and Stability of Poly (lactic acid)

更新时间：2022-09-18

- Thermal Degradability and Stability of Poly (lactic acid)
- Polymer Bulletin Vol. 28, Issue 7, Pages: 57-64(2015)
- 作者机构：
  
  天津科技大学材料科学与化学工程学院，天津　300457
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2015.07.008
  CLC：
- Published：2015-07，
  
  Received：10 October 2014，
  
  Revised：05 February 2015，
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Biao WANG, Tong WAN, Wei ZENG. Thermal Degradability and Stability of Poly (lactic acid). [J]. Polymer Bulletin 28(7):57-64(2015)
DOI：

Biao WANG, Tong WAN, Wei ZENG. Thermal Degradability and Stability of Poly (lactic acid). [J]. Polymer Bulletin 28(7):57-64(2015) DOI： 10.14028/j.cnki.1003-3726.2015.07.008.

摘要

通过凝胶渗透色谱(GPC)和流变学手段研究了光学稳定剂UV-944、UV-531、UV-9、抗氧剂7910以及甲基丙烯酸缩水甘油酯（GMA)和亚磷酸三苯酯（TPP)六种助剂对聚乳酸(PLA)的的热降解和热稳定性的影响。结果表明：PLA粒料经混炼压片后重均分子量由13.6万下降至10. 1万；经过180℃下热处理5h，纯PLA的重均分子量由10. 1万下降至3. 7万，而填加0. 25%(wt)的TPP可使PLA基体的重均分子量由10. 1万下降至9. 1万；TPP含量为0. 25%(wt)样品的储能模量和复数粘度在整个研究时间范围内均保持稳定不变。这些结果表明，TPP的引入有效地阻止了 PLA的热降解。UV-944和抗氧剂7910改性PLA样品的重均分子量分别保持在13.3万和12.1万左右，有效地改善了基体的热稳定性。复配助剂UV-944 + 7910对于PLA基体热稳定性的提高具有协同作用，其效果优于各单一助剂，其它复配助剂均对PLA基体热稳定性的改善效果不佳。

Abstract

The poly (lactic acid) (PLA) was modified with three kinds of light stabilizer

UV-944

UV-531

UV-9 and antioxidant 7910

glycidyl methacrylate (GMA) and Triphenyl phosphate (TPP). The thermal stabilities of all modified specimens were studied by gel permeation chromatography (GPC) and rheological tests. The results showed that weight- average molecular weights of neat PLA pellet declined from 136000 to 101000 by melt-blending and press-molding. After heat treatment at 180℃ for 5h

weight-average molecular weight of pure PLA declined from 101000 to 37000

while that of PLA modified with 0. 25%(wt) TPP decreased from 101000 to 91000. The storage modulus and complex viscosity of PLA modified with 0. 25 % (wt) TPP remained constant within the studied range. These results indicate that the introduction of TPP effectively prevent thermal degradation of PLA. Weight-average molecular weights of PLA modified with UV-944 and antioxidant 7910 were maintained at about 133000 and 121000

respectively. UV-944 and antioxidant 7910 effectively improve the thermal stability of the PLA matrix. UV-944 and antioxidant 7910 together have a synergetic effect on the improved thermal stability of PLA

while other compound additives have little improvement on thermal stability of the matrix.

关键词

聚乳酸热稳定性助剂分子量

Keywords

Poly (lactic acid)Thermal stabilityAdditiveMolecular weight

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