作者：Dongdong Wang, Jiapeng Li, Jing Jin, Yanxiong Pan, Haojun Liang, Xiangling Ji, Wei Jiang
关键字：聚合物改性, 聚碳酸丙烯酯, 压敏胶粘剂, 可生物降解, 内聚与粘附
论文来源：期刊
具体来源：ACS Applied Polymer Materials, 2024, 6(15), 8896-8904
发表时间：2024年

摘要：压敏胶粘剂（PSAs）的挑战在于开发具有突出热稳定性和可观剥离强度的可生物降解PSAs。为克服这一缺点，本文采用无溶剂方法设计并合成了一系列4,4''-二苯基甲烷二异氰酸酯（MDI）改性的氯磺化聚碳酸丙烯酯（CSPPC-MDIs）。研究发现，MDI的引入可有效提高分子量、Tg和热稳定性，表明MDI既作为封端剂又作为扩链剂。流变曲线、粘性测试和剥离测试结果表明，CSPPC-MDIs比原始CSPPC具有更高的粘附性能和剥离强度。此外，通过调节MDI投料比可控制CSPPC-MDIs的粘合和内聚性能。CSPPC-MDI-3.0（CSPPC与3 wt% MDI的反应产物）具有突出的剥离强度（9.1±0.1 N/cm）和可生物降解特性，优于3M 810、3M 2929和AveryDennison 5078A等商用PSAs，表明CSPPC-MDIs未来可用作高性能PSAs的更好候选材料。

Abstract：The challenge of pressure-sensitive adhesives (PSAs) is to develop biodegradable PSAs with prominent thermal stability and considerable peel strength. To overcome this drawback, we designed and synthesized a series of 4,4''-diphenylmethane diisocyanate (MDI)-modified chlorosulfonated poly(propylene carbonate)s (CSPPC-MDIs) using a solvent-free method. We found that the introduction of MDI can effectively increase the molecular weight, Tg, and thermal stability, demonstrating that MDI acts as both a capping reagent and chain extender. Rheology profiles, tack test and peel test results demonstrate that CSPPC-MDIs exhibit higher adhesion properties and peel strengths than original CSPPC. Furthermore, the adhesive and cohesive properties of CSPPC-MDIs can be controlled by tuning the MDI feed ratios. The CSPPC-MDI-3.0 (the reaction product of CSPPC and 3 wt% MDI) has a prominent peel strength (9.1±0.1 N/cm) and biodegradable features compared to commercial PSAs such as 3M 810, 3M 2929, and AveryDennison 5078A, indicating that CSPPC-MDIs can be used as a better candidate for high-performance PSAs in the future.

论文链接：https://doi.org/10.1021/acsapm.4c01101