Improving the Crystallization Properties and Foaming Behavior of Poly(lactic acid) Enantiomeric Blends through Cross-linking Modification

GAO Meng-ju; WU Bao-gou; ZHOU Chun-hui; WANG Long

doi:10.14028/j.cnki.1003-3726.2025.25.136

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Improving the Crystallization Properties and Foaming Behavior of Poly(lactic acid) Enantiomeric Blends through Cross-linking Modification

更新时间：2025-09-23

- Improving the Crystallization Properties and Foaming Behavior of Poly(lactic acid) Enantiomeric Blends through Cross-linking Modification
- Polymer Bulletin Vol. 38, Issue 10, Pages: 1500-1510(2025)
- 作者机构：
  
  1.浙江工业大学化学工程学院，杭州 310014
  2.中国科学院宁波材料技术与工程研究所，宁波 315201
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2025.25.136
  CLC：
- Received：03 May 2025，
  
  Accepted：07 July 2025，
  
  Published Online：27 August 2025，
  
  Published：20 October 2025
- 稿件说明：
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高梦菊, 吴保钩, 周春晖, 汪龙. 通过交联改性改善聚乳酸对映体共混物的结晶性能和发泡行为. 高分子通报, 2025, 38(10), 1500–1510.

Gao, M. J.; Wu, B. G.; Zhou, C. H.; Wang, L. Improving the crystallization properties and foaming behavior of poly(lactic acid) enantiomeric blends through cross-linking modification. Polym. Bull. (in Chinese), 2025, 38(10), 1500–1510.
高梦菊, 吴保钩, 周春晖, 汪龙. 通过交联改性改善聚乳酸对映体共混物的结晶性能和发泡行为. 高分子通报, 2025, 38(10), 1500–1510. DOI： 10.14028/j.cnki.1003-3726.2025.25.136.

Gao, M. J.; Wu, B. G.; Zhou, C. H.; Wang, L. Improving the crystallization properties and foaming behavior of poly(lactic acid) enantiomeric blends through cross-linking modification. Polym. Bull. (in Chinese), 2025, 38(10), 1500–1510. DOI： 10.14028/j.cnki.1003-3726.2025.25.136.

摘要

在聚乳酸(PLA)泡沫中构建高含量立构复合(SC)晶体，目前仍面临较大挑战。本研究利用引发剂双叔丁基过氧化二异丙基苯(BIPB)和交联剂三烯丙基异氰脲酸酯(TAIC)对左旋聚乳酸/右旋聚乳酸(PLLA/PDLA)共混物的分子链进行交联，并结合环保CO

发泡技术制备了PL

LA/PDLA/BIPB/TAIC发泡材料。结果表明：交联网络改善了PLLA/PDLA共混物的结晶性能，促进了SC晶体的形成并改善了SC晶体的熔体记忆效应。与此同时，交联网络提高了PLA的熔体强度，改善了PLA的发泡性能，从而制备出了泡孔结构良好且SC晶体质量分数高达35.2%的PLA泡沫。高含量SC晶体赋予交联PLA泡沫高耐热性，使其在200 ℃下的储能模量达到264.3 kPa，显著高于未交联泡沫的31.4 kPa。

Abstract

Constructing poly(lactic acid) (PLA) foams with a high stereocomplex (SC) crystallite content remains a significant challenge. In this study

we employed di-tert-butyl diisopropylbenzene peroxide (BIPB) as the initiator and triallyl isocyanurate (TAIC) as the cross-linker to induce cross-linking in poly(

-lactic acid)/poly(

-lactic acid) (PLLA/PDLA) blends. These modified blends were subsequently processed using an environmentally friendly CO

foaming technique to produce PLLA/PDLA/BIPB/TAIC foams. The results demonstrated that the crosslinked network enhanced the crystallization behavior of the PLLA/PDLA blends

facilitated the formation of SC crystallites

and improved the melt memory effect. Additionally

the crosslinked structure increased the melt strength and foaming performance of PLA

enabling the fabrication of PLA foams with a uniform cell structure and SC crystallite mass fraction of up to 35.2%. The increased SC content significantly enhanced the thermal resistance of the crosslinked PLA foam

resulting in a storage modulus of 264.3 kPa at 200 ℃

which is considerably higher than that of the uncrosslinked counterpart (31.4 kPa).

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