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首页> 外文期刊>Journal of Applied Polymer Science >The preparation and crystallization of long chain branching polylactide made by melt radicals reaction
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The preparation and crystallization of long chain branching polylactide made by melt radicals reaction

机译：熔融自由基反应制备长支链聚丙交酯及其结晶

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摘要

Long chain branching (LCB) of polylactic acid (PLA) was successfully prepared by melt radicals reaction with pentaerythritol triacrylate (PETA) and bis (1-methyl-1-phenylethyl) peroxide (DCP). The topological structure of the LCB was investigated by rheology and branch-on-branch (BOB) model was used to estimate the exact chain structures of the products, where comb-like LCB structures were generated due to the complex coupling between different macro-radicals. LCB structure was found to affect the crystallization of PLA products. In the temperature range of 110-130°C, the crystallization rate parameter (k) was improved sharply and the half crystallization time was decreased significantly after the grafting of PETA, which was ascribed to the enhanced hydrogen bonding in PETA-grafted long chain branching PLA. By comparing with the LCB PLA made from chain extension using multifunctional monomer, it shows that the crystallization becomes slower in a highly branched material with extremely long relaxation time if the effect of hydrogen bonding is similar.
机译：通过季戊四醇三丙烯酸酯（PETA）和双（1-甲基-1-苯基乙基）过氧化物（DCP）的熔融自由基反应成功地制备了聚乳酸（PLA）的长支链（LCB）。通过流变学研究了LCB的拓扑结构，并使用了分枝分支（BOB）模型来估计产品的确切链结构，其中由于不同的宏基之间的复杂耦合而产生了梳状LCB结构。发现LCB​​结构影响PLA产物的结晶。在110-130°C的温度范围内，PETA接枝后结晶速率参数（k）显着提高，半结晶时间显着减少，这归因于PETA接枝长链支化过程中氢键的增强解放军。通过与使用多功能单体扩链制备的LCB PLA进行比较，表明如果氢键合作用相似，则在高度支化的材料中，结晶的速度会变慢，且弛豫时间非常长。

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