Molecular structure design and epoxy functional modification of star-shaped poly(lactic acid) by a melt polycondensation strategy,Reaction Chemistry & Engineering

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Molecular structure design and epoxy functional modification of star-shaped poly(lactic acid) by a melt polycondensation strategy
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2023-12-01 , DOI: 10.1039/d3re00573a
Jiajie Yu ₁ , Yi Huang ₁ , Songting Yu ₁ , Zepeng Huang ₁ , Shujie Yu ₂ , Ling Zhou ₁ , Shaoxian Peng ₁ , Xipo Zhao ₁

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The preparation of polylactic acid (PLA) by melt polycondensation has received increasing attention due to its simple process and lower cost. However, the low molecular weight of PLA prepared through melt polycondensation limits its application range. The introduction of branched structures and active groups into PLA has emerged as an important means to expand its application. In this study, pentaerythritol and sorbitol were used as core molecules for melt polycondensation with L-lactic acid. The effect of reaction parameters on the viscosity average molecular weight of two types of star-shaped PLA was studied. The branched structure of PLA was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and the effects of branch chain length and number on the rheological and crystallization behavior of PLA were further analyzed. The star-shaped PLA was solution-grafted with allyl glycidyl ether, which is flexible and difficult to self-polymerize, resulting in the preparation of epoxy-functionalized star-shaped PLA with an epoxy value of 0.293 mol/100 g and gel content of 5.15%. This material is expected to find applications in environmentally friendly epoxy coatings, adhesives, and special compatibilizers for PLA, and to address the problems of difficult degradation and nonrecycling of thermosetting epoxy resin.

中文翻译：

熔融缩聚策略星形聚乳酸的分子结构设计和环氧功能改性

熔融缩聚法制备聚乳酸（PLA）因其工艺简单、成本较低而受到越来越多的关注。然而，熔融缩聚制备的PLA分子量较低，限制了其应用范围。在PLA中引入支化结构和活性基团已成为扩大其应用的重要手段。本研究以季戊四醇和山梨醇为核心分子与L-乳酸进行熔融缩聚。研究了反应参数对两种星型PLA粘均分子量的影响。采用傅里叶变换红外光谱和质子核磁共振表征了PLA的支化结构，并进一步分析了支链长度和数量对PLA流变和结晶行为的影响。将星型PLA与柔性且不易自聚的烯丙基缩水甘油醚进行溶液接枝，制得环氧官能化星型PLA，环氧值为0.293 mol/100 g，凝胶含量为5.15%。该材料有望在环保型环氧涂料、粘合剂、PLA专用相容剂等方面得到应用，并解决热固性环氧树脂难以降解和不可回收的问题。

更新日期：2023-12-06

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