Sustainable terpene triblock copolymers with tuneable properties for pressure sensitive adhesive applications
Sustainable terpene triblock copolymers with tuneable properties for pressure sensitive adhesive applications
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DOI：
10.1016/j.polymertesting.2022.107530
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发表时间：
2022-03-11
期刊：
影响因子：
5.1
通讯作者：
De Focatiis, D. S. A.
中科院分区：
文献类型：
--
作者：
Elsmore, M. T.;Atkinson, R. L.;De Focatiis, D. S. A.
合成了一系列硬-软-硬嵌段配置的三嵌段共聚物，具有不同的硬嵌段α-蒎烯甲基丙烯酸酯含量和分子量以及丙烯酸丁酯软链段，并研究了其在压敏粘合剂（PSA）应用中的可行性。形态各异，从分布在连续软基体内的硬相袋，到具有共连续相的层状，最后是分散有软相袋的连续硬相。展示了七种组合物（包括四种短链和三种长链共聚物）的单轴拉伸性能、探针粘合性能和循环粘合行为，以及商业基准 PSA。对新型弹性体的结构-性能关系进行了评估，确定含有 20-25 wt% 聚（α-蒎烯甲基丙烯酸酯）的短链材料可提供与商业弹性体相似的拉伸和粘合性能。据观察，提高硬相浓度可显着提高极限拉伸强度、刚度和峰值粘力，但代价是极限拉伸应变、粘合剂粘结位移和振动耗散显着降低。结果表明，可以调整这些可持续材料的性能，以生产具有一系列有用特性的可行的 PSA。
A series of triblock copolymers in a hard-soft-hard block configuration with varying hard block alpha-pinene methacrylate content and molecular weight and butyl acrylate soft segment have been synthesised and investigated for viability in pressure sensitive adhesive (PSA) applications. The morphologies vary from pockets of hard phase distributed within a continuous soft matrix, through to lamellar with co-continuous phases, and finally continuous hard phase with pockets of soft phase dispersed. Uniaxial tensile properties, probe adhesion performance and cyclic adhesive behaviour are presented for seven compositions including four short chain and three long chain copolymers, alongside a commercial benchmark PSA. Structure-property relationships for the novel elastomers are evaluated, establishing that short chain materials with 20-25 wt% poly(alpha-pinene methacrylate) offer similar tensile and adhesion performance to the commercial elastomer. Raising the hard phase concentration has been observed to provide a considerable increase in ultimate tensile strength, stiffness and peak tack force, but at the expense of significant reductions in ultimate tensile strain, adhesive bond displacement and vibrational dissipation. The results suggest that the performance of these sustainable materials can be tuned to produce viable PSAs with a range of useful properties.