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首页> 外文期刊>Journal of Applied Polymer Science >Melt versus solvent coating: Structure and properties of block-copolymer-based pressure-sensitive adhesives
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Melt versus solvent coating: Structure and properties of block-copolymer-based pressure-sensitive adhesives

机译：熔体与溶剂涂料：嵌段共聚物基压敏胶的结构和性能

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Pressure-sensitive adhesives (PSAs) composed of a styrene-isoprene-styrene triblock copolymer and a midblock-associating resin were prepared via solvent and hot-melt coating. The formulations and thermal histories up to the point of coating were identical, yet significant differences in the properties were observed as a function of the coating method. The solvent-coated PSA showed superior shear holding power, and the hot-melt-coated PSA performed better in tack and peel tests. Two factors resulting from the processing conditions were responsible for these property differences. The quick cooling process occurring after hot-melt coating led to a poorly defined microstructure and, therefore, less physical crosslinking. Rheological data for melt-pressed and solvent-cast PSA films confirmed these microstructural differences. The increased solubility of the tackifier in the solvent additionally created a composition gradient in the solvent coating. Annealing improved the long-range order of both hot-melt and solvent coatings, producing a body-centered cubic microstructure identified by small-angle X-ray scattering. This microstructure improved the shear strength of both types of adhesive coatings, whereas the peel and tack properties of the solvent coatings remained inferior to those of the hot-melt coatings because of differences in the surface compositions. (C) 2002 Wiley Periodicals, Inc. [References: 40]
机译：通过溶剂和热熔涂布制备由苯乙烯-异戊二烯-苯乙烯三嵌段共聚物和中嵌段缔合树脂组成的压敏粘合剂（PSA）。直到涂覆点为止的配方和热历史是相同的，但是观察到性质随涂覆方法的变化有显着差异。溶剂涂布的PSA表现出优异的剪切保持力，而热熔涂布的PSA在粘性和剥离试验中表现更好。这些特性差异是由加工条件引起的两个因素造成的。热熔涂层后发生的快速冷却过程导致微观结构定义不明确，因此导致较少的物理交联。熔融压制和溶剂浇铸的PSA膜的流变数据证实了这些微观结构差异。增粘剂在溶剂中增加的溶解度还在溶剂涂层中产生了组成梯度。退火改善了热熔涂层和溶剂涂层的远距离有序性，产生了以小角度X射线散射识别的以体心为中心的立方微观结构。这种微观结构提高了两种类型粘合剂涂层的剪切强度，而由于表面组成的不同，溶剂涂层的剥离和粘着性能仍然不及热熔涂层。 （C）2002 Wiley Periodicals，Inc. [参考：40]

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