Effects of epoxy resin crosslinking networks on stereocomplexation of poly(l‐lactic acid)/poly(d‐lactic acid) racemic blends,Polymer International

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Effects of epoxy resin crosslinking networks on stereocomplexation of poly(l‐lactic acid)/poly(d‐lactic acid) racemic blends
Polymer International ( IF 2.9 ) Pub Date : 2020-11-04 , DOI: 10.1002/pi.6153
Zhaolei Li ₁ , Xinxin Ye ₁ , Chunfeng Meng ₁ , Haijun Zhou ₁ , Weijie Guo ₁ , Shangtao Chen ₂ , Jianming Zhang ₃ , Chao Yan ₁ , Alain Dufresne ₄

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In contrast to existing methods that add specific substances to poly(l‐lactic acid)/poly(d‐lactic acid) racemic blends to enhance stereocomplexation, in this study, a crosslinkable epoxy resin (EP) was introduced into a racemic blend. The results showed that, when the mass ratio of EP to racemic blend was 0.2:1 (EP:racemic blend = 0.2), regardless of the amount of diethylenetriamine (DETA) curing agent, homo‐crystals in the racemic blend were essentially inhibited. With a fixed EP content, a 0.05:1 DETA to EP mass ratio resulted in a homogeneous poly(l‐lactic acid)/poly(d‐lactic acid)/EP/DETA mixture. Uniformly dispersed EP network promoted the stereocomplexation of the racemic blend from the melt, but delayed the lamellar thickening of the stereocomplex crystals during heating. Thus, the constrained chain diffusion caused by the uniformly dispersed EP network was likely responsible for these contradictory results. Introducing uniformly dispersed network into poly(l‐lactic acid)/poly(d‐lactic acid) racemic blends is presumably a promising approach for gaining more insight into poly(lactic acid) stereocomplexation. © 2020 Society of Industrial Chemistry

中文翻译：

环氧树脂交联网络对聚（l-乳酸）/聚（d-乳酸）外消旋共混物立体配合的影响

与现有的向聚（l-乳酸）/聚（d-乳酸）外消旋共混物中添加特定物质以增强立体络合的方法相反，在本研究中，将可交联环氧树脂（EP）引入到了外消旋共混物中。结果表明，当EP与外消旋共混物的质量比为0.2：1（EP：外消旋共混物= 0.2）时，无论二乙撑三胺（DETA）固化剂的量如何，外消旋共混物中的均相晶体均得到基本抑制。在EP含量固定的情况下，DETA与EP的质量比为0.05：1，可得到均质的聚（l-乳酸）/ poly（d-乳酸）/ EP / DETA混合物。均匀分散的EP网络促进了熔体中外消旋共混物的立体复合，但在加热过程中延迟了立体复合晶体的层状增稠。因此，由均匀分散的EP网络引起的受约束的链扩散很可能是造成这些矛盾结果的原因。将均匀分散的网络引入聚（l-乳酸）/聚（d-乳酸）外消旋共混物中，可能是获得更多关于聚乳酸立体复合的见识的有前途的方法。©2020工业化学学会

更新日期：2020-11-04

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