作者：Jiapeng Li, Dongdong Wang, Jing Jin, Fushi Li, Yunbao Gao, Hongwen Liang, Wei Jiang
关键字：热熔胶粘剂, 氯化聚碳酸丙烯酯, 聚乳酸, 扩链, 生物降解
论文来源：期刊
具体来源：ACS Applied Polymer Materials, 2023, 5(12), 10256-10264
发表时间：2023年

摘要：热熔胶粘剂因其价格实惠和使用方便而常用于包装和各类产品。尽管已使用不同聚合物制备热熔胶粘剂，但在这些胶粘剂中同时实现高性能和可生物降解性仍是重大挑战。本文通过以4,4''-二苯基甲烷二异氰酸酯（MDI）为扩链剂的扩链反应，制备了氯化聚碳酸丙烯酯（CPPC）与聚乳酸（PLA）的共聚物（CPPC-PLA）。将PLA加入CPPC链后，共聚物分子量增加，热稳定性提高，同时不损害生物降解性。通过改变MDI浓度制备了不同扩链程度的CPPC-PLA共聚物。MDI加入越多，共聚物的力学性能、储能模量（G''）和损耗模量（G'）越高。更重要的是，向CPPC-PLA共聚物引入7 wt% MDI后，粘性和剪切强度显著提高，分别提升108%和134%。CPPC-PLA共聚物兼具可生物降解性和优异性能，丰富了热熔胶粘剂类别，并为其他领域潜在应用打开了大门。

Abstract：Hot melt adhesives are commonly used in packaging and various types of products due to their affordability and convenience. Despite the use of different polymers for preparing hot melt adhesives, achieving both high performance and biodegradability in these adhesives remains a significant challenge. Herein, we fabricate copolymers of chlorinated poly(propylene carbonate) (CPPC) and polylactic acid (PLA) (CPPC-PLA) through a chain extension reaction that involves 4,4''-diphenylmethane diisocyanate (MDI) as the chain extender. By adding PLA to the CPPC chains, the copolymers'' molecular weight increases, and their thermal stability improves without compromising their biodegradability. Additionally, CPPC-PLA copolymers with various degrees of chain extension are prepared by modifying the MDI concentration. When more MDI is added, the mechanical properties, storage modulus (G''), and loss modulus (G') of copolymers are improved. More importantly, the introduction of 7 wt% MDI to CPPC-PLA copolymers results in a significant increase in both tack and shear strengths, with improvements of 108 and 134%, respectively. CPPC-PLA copolymers have the advantage of being biodegradable while also delivering exceptional performance, enriching the category of hot melt adhesives and opening the door for potential applications in other fields.

论文链接：https://doi.org/10.1021/acsapm.3c02029