用热熔聚烯烃粘合剂分析等规聚丙烯的粘合界面,Macromolecules

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用热熔聚烯烃粘合剂分析等规聚丙烯的粘合界面
Macromolecules ( IF 5.1 ) Pub Date : 2021-06-08 , DOI: 10.1021/acs.macromol.1c00647
Takuya Matsumoto ₁ , Yosuke Shimizu ₁ , Takashi Nishino ₁

Affiliation

全同立构聚丙烯（it .PP）的界面结构和性能在基础科学和工业应用中受到广泛关注，以改善其较差的粘合性能。聚丙烯。在这项工作中，我们专注于使用它的层压板.PP 基材和各种不同分子量和结晶度的乙烯-辛烯橡胶 (EOR) 热熔粘合剂。我们使用低分子量 EOR、无规共聚 EOR 和嵌段共聚 EOR 作为粘合剂制备层压板样品。我们对层压板样品进行了 T 型剥离测试，并使用共焦拉曼散射成像、X 射线折射对比成像和原子力显微成像评估了它们的界面厚度。具有较大界面厚度的层压板具有较大的 T 剥离强度，这与所有测量方法中获得的结果相对一致。结果表明，粘合性能和界面厚度取决于它的结晶度。PP基材。这些结果意味着界面不仅可以通过分子链的扩散来构建，而且还可以通过界面区域中的晶体生长和薄片互锁的形成来构建。

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Analyses of the Adhesion Interphase of Isotactic Polypropylene Using Hot-Melt Polyolefin Adhesives

The interphase structure and properties of isotactic polypropylene (it.PP) have received much attention in the fundamental science and industrial applications for the improvement of the poor adhesion properties of the it.PP. In this work, we focused on the laminates with it.PP substrates and various ethylene–octene rubber (EOR) hot-melt adhesives with different molecular weights and crystallinities. We prepared laminate samples using EOR with low molecular weight, random copolymerized EOR, and block-like copolymerized EOR as adhesives. We performed T-peel tests of the laminate samples and evaluated their thickness of the interphase with confocal Raman scattering imaging, X-ray refraction contrast imaging, and atomic force microscopic imaging. The laminates with larger interphase thicknesses possessed the larger T-peel strengths, which were relatively consistent with these obtained results among all the measurement methods. It is revealed that the adhesion properties and the interphase thicknesses depended on the crystallinities of the it.PP substrates. These results mean that the interphase would be constructed by not only diffusion of molecular chains but also the crystalline growth and the formation of lamellae interlock in the interphase region.

更新日期：2021-08-10

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