摘要
Abstract
A high-adhesion thermoplastic starch-based hot melt adhesive(HMA)was prepared using a two-step method involving tartaric acid-modified thermoplastic starch(TPSTA1).Ethylene-vinyl acetate(EVA),rosin,and aluminum powders were incorporated into HMA via melt blending.The effects of varying EVA,rosin,and aluminum powder con-tent on the adhesive's flow properties,adhesion strength,viscoelasticity,and compatibility were systematically investi-gated.Experimental results indicated that increasing the HMA(a blend of EVA and rosin)and aluminum powder con-tents initially enhanced adhesive strength,flowability,and surface energy,followed by a subsequent decrease.Opti-mized formulations significantly improved adhesive strength in copper lap joints,aluminum foil peel tests,and nonwoven fabric peel tests.Furthermore,incorporating HMA and aluminum powders disrupted the hydrogen bonding network within TPSTA1,enhancing starch chain molecular mobility.This caused a shift from predominantly viscoelastic to more viscous behavior,thereby improving the adhesive system's stability.Microstructural analysis indicated limited compatibil-ity between TPSTA1 and rosin at high HMA contents,resulting in a sea-island morphology.EVA acted as a compatibil-ity enhancer,improving interfacial adhesion.Aluminum powders dispersed uniformly at low concentrations but exhibited agglomeration tendencies at higher levels.This study provides theoretical support for optimizing the performance and ex-panding the application potential of thermoplastic starch-based hot melt adhesives.关键词
热熔胶/热塑性淀粉/生物基/高粘接强度/界面黏附Key words
hot melt adhesive/thermoplastic starch/biobased/high bonding strength/interfacial adhesion分类
化学化工
