Weijie Xie, Shaojie Zhang, Xiangyun Gong, Caixia Zhao, Guoxiang Zou
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引用次数: 0
摘要
在本研究中，我们采用了两种不同的支化助剂，通过与3,6,9-三乙基-3,6,9-三甲基-1,4,7-三过氧酮（Trigonox301）和PLA熔融接枝，优化了长链支化聚乳酸（lbc -PLA）的拓扑结构。我们的研究结果表明，仅添加2%的烯丙基甘油醚（AGE）和0.75%的Trigonox301， PLA的分支度就能达到22.8%。采用基于分子量分布、零剪切粘度η0和相位角的三种数学模型定量评价了支化程度。值得注意的是，当使用分子量分布拟合得到的LCBG时，凝胶的存在使分支度的精确测定变得复杂。相比之下，由复粘度拟合得到的LCB-PLA样品的η0和LCBC分别从2140 Pa s和0 mol %显著上升到13286 Pa s和22.8 mol %。此外，AGE的环氧基与PLA分子链羧基之间的优先端基反应表明AGE比三甲基丙烷三丙烯酸酯（TMPTA）更有效地提高支化度。
High Melt Strength Polylactic Acid: Synergistic Effect of Peroxides and Branching Coagents on Long-Chain Branching
In this study, we employed two distinct branching coagents to optimize the topology structure of long-chain branched polylactide (LCB-PLA) via melt grafting with 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane (Trigonox301) and PLA. Our findings reveal that an impressive 22.8% degree of branching degree in PLA was attainable with the addition of merely 2 wt % allyl glycidyl ether (AGE) and 0.75% Trigonox301. Three mathematical models were applied to quantitatively assess the degree of branching based on molecular weight distribution, zero-shear viscosity η0, and phase angle. Notably, the presence of gel complicated the precise determination of the branching degree when using LCBG derived from molecular weight distribution fitting. Comparatively, the η0 and LCBC, derived from complex viscosity fitting for LCB-PLA samples enriched with 2 wt % AGE, saw a marked escalation from 2140 Pa s and 0 mol % to 13286 Pa s and 22.8 mol %, respectively.
Furthermore, the preferential end-group reaction between the epoxy group of AGE and the carboxyl group of the PLA molecule chain indicated that AGE was more efficacious in enhancing the branching degree than trimethylolpropane triacrylate (TMPTA).
期刊介绍：
Polymer Science, Series B is a journal published in collaboration with the Russian Academy of Sciences. Series B experimental and theoretical papers and reviews dealing with the synthesis, kinetics, catalysis, and chemical transformations of macromolecules, supramolecular structures, and polymer matrix-based composites (6 issues a year). All journal series present original papers and reviews covering all fundamental aspects of macromolecular science. Contributions should be of marked novelty and interest for a broad readership. Articles may be written in English or Russian regardless of country and nationality of authors. All manuscripts are peer reviewed
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