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Effect of Molecular Weight of Epoxidized Natural Rubber on Shear Strength of Adhesives

机译:环氧天然橡胶的分子量对胶粘剂剪切强度的影响

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摘要

The dependence of shear strength of epoxidized natural rubber (ENR)-based adhesives on molecular weight of the rubber is studied using coumarone-indene resin, gum rosin, and petro resin as tackifiers. The adhesive was coated on polyethylene terephthalate (PET) film substrate using a SHEEN hand coater at various coating thickness. The shear strength of adhesives was determined by a Texture Analyzer. Results show a maximum at 6.63 x 10(4) and 4.14 x 10(4) for ENR 25 and ENR 50, respectively, after which the shear strength decreases with further increases in molecular weight for all the coating thickness. This observation is attributed to varying degree of cohesiveness which culminates at the respective optimum molecular weight of ENR.
机译:使用香豆酮-茚树脂,松香和石油树脂作为增粘剂,研究了环氧化天然橡胶(ENR)基胶粘剂的剪切强度对橡胶分子量的依赖性。使用SHEEN手动涂布机将粘合剂以各种涂层厚度涂布在聚对苯二甲酸乙二醇酯(PET)膜基材上。粘合剂的剪切强度通过纹理分析仪确定。结果表明,ENR 25和ENR 50的最大值分别为6.63 x 10(4)和4.14 x 10(4),此后,在所有涂层厚度下,剪切强度随着分子量的进一步降低而降低。该观察结果归因于不同的内聚度,其最终达到ENR各自的最佳分子量。

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