Shear, tack, and peel of polyisobutylene: effect of molecular weight and molecular weight distribution
Shear, tack, and peel of polyisobutylene: effect of molecular weight and molecular weight distribution
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聚异丁烯的剪切、粘性和剥离：分子量和分子量分布的影响
DOI：
10.1002/pen.760290108
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发表时间：
1989
影响因子：
3.2
通讯作者：
Julian F. Johnson
中科院分区：
文献类型：
--
作者：
M. Krenceski;Julian F. Johnson
以工业聚异丁烯为模型体系，研究了聚合物分子量及其分布对压敏胶性能的影响。分子量，其特征在于通过尺寸排阻色谱法和膜渗透压。基于标准化测试方法，通过剪切、剥离和探针粘性测试来评估压敏粘合剂性能。较低分子量聚异丁烯（Mw <600，000）在剥离和探针粘性测试中是成功的，因为它们能够快速流动并润湿基材测试表面。然而，它们在剪切中不起作用，其中聚合物必须在负载下抵抗流动。相比之下，高分子量物质在抗剪切性测试中表现良好，在剥离和探针粘性测试中不太成功。当高分子量和低分子量聚异丁烯共混以加宽分子量分布同时保持恒定的重均分子量时，剪切、剥离和探针粘性的粘合剂性能得到改善。发现所有测试的粘合剂性能都以聚合物的一些基本流变性能为基础（例如，剪切粘度和拉伸蠕变柔量）。这表明使用基本的流变学特性筛选胶粘剂配方的经验粘合剂测试方法。
The effect of polymeric molecular weight and molecular weight distribution on pressure-sensitive adhesive performance was studied in a model system of commercial polyisobutylenes. Molecular weight was characterized by size exclusion chromatography and membrane osmometry. Pressure sensitive adhesive performance was assessed by shear, peel, and probe tack testing based on standardized test methods. Lower molecular weight polyisobutylenes (Mw < 600,000) are successful in peel and probe tack testing due to their ability to flow quickly and wet the substrate test surface. They do not function as well in shear, however, where the polymer must resist flow under a load. High molecular weight species, by contrast, perform well in shear resistance tests and less successfully in peel and probe tack testing. Where high and low molecular weight polyisobutylenes are blended to broaden the molecular weight distribution while maintaining constant weight average molecular weight, adhesive performance in shear, peel, and probe tack are improved. All of the adhesive properties tested were found to have their foundation in some fundamental rheological properties of the polymers (e.g., shear viscosity and tensile creep compliance). This suggests the use of fundamental rheological characterization for screening of adhesive formulations over more empirical adhesive testing methods.