Thermosetting film adhesives based on maleimide-modified-phenol-functional acrylic copolymers
Thermosetting film adhesives based on maleimide-modified-phenol-functional acrylic copolymers
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DOI：
10.1163/156856101750430440
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发表时间：
2001-01
影响因子：
2.3
通讯作者：
C. Gouri;C. R. Nair;R. Ramaswamy
中科院分区：
文献类型：
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作者：
C. Gouri;C. R. Nair;R. Ramaswamy
以丙烯酸丁酯(BUA)、丙烯腈(AN)和不同比例的N-(4-羟基苯基)马来酰亚胺(HPM)为原料，通过不同的苯酚基团反应，合成了丙烯酸丁酯(BUA)、丙烯腈(AN)和不同比例的N-(4-羟基苯基)马来酰亚胺(HPM)三元共聚聚合物。这包括用二环氧化合物和六亚甲基四胺(HMTA)固化苯酚基团，以及由其衍生的炔丙基醚和氰酸酯基团的热固化。这些热固性树脂表现出良好的成膜性能，并使用铝粘合剂对它们的粘接性能进行了评估。研究发现，与热塑性胶粘剂相比，通过苯酚-环氧反应使聚合物发生交联反应，可以有效地提高材料的力学性能和粘接性能，并提供更好的热胶性能。在环氧交联型(EpBNM)聚合物中，HPM含量为9.5wt%的聚合物具有最佳的常温粘接性能。通过甲基丙烯酸缩水甘油酯(GMA)与BUA、AN和HPM的共聚反应，合成了具有最佳环氧量和最佳苯酚含量的单组分热固性聚合物(GlyBNM)。与相同组成的EPBNM相比，GlyBNM的粘接性能较差。通过HMTA对BNM进行交联会产生一种粘接性能降低的脆性聚合物。BNM聚合物在将苯酚基团转化为丙烯基醚和氰酸酯后进行热固化，并没有提高粘接性能，这表明环氧交联体系比其他体系更优越。
Pendant phenol-functional thermoplastic butylacrylate-acrylonitrile-maleimidophenol (BNM) terpolymers synthesized by free radical copolymerization of butyl acrylate (BuA), acrylonitrile (AN), and varying proportions of N-(4-hydroxy phenyl) maleimide (HPM) were cross-linked through different phenol group reactions. This included curing of the phenol group with a diepoxide and hexamethylene tetramine (HMTA), and thermal curing of the propargyl ether and cyanate ester groups derived from it. These thermosets exhibited good film-forming properties and their adhesive properties were evaluated using aluminium adherends. Cross-linking the polymers through phenol-epoxy reaction was found to be very effective in enhancing the mechanical and adhesive properties and for imparting a better thermoadhesive profile in comparison to the thermoplastic adhesive. Among the epoxy cross-linked (EpBNM) polymers, the optimum adhesive properties at ambient temperature were obtained for a polymer containing 9.5 wt% HPM. A single component thermosetting polymer (GlyBNM) containing the optimum epoxy and phenol content was synthesized by copolymerization of glycidyl methacrylate (GMA) with BuA, AN, and HPM. When compared to EpBNM of identical composition, the adhesive properties of GlyBNM were inferior. Cross-linking of BNM through HMTA produced a brittle polymer with reduced adhesive properties. Thermal curing of the BNM polymer, after transformation of the phenol groups to propargyl ether and cyanate ester, did not enhance the adhesive properties, implying the superiority of the epoxy cross-linked system over the other systems.