Study of Hyperbranched Poly(ethyleneimine) Polymers of Different Molecular Weight and Their Interaction with Epoxy Resin

被引:32
作者
Roman, Frida [1 ]
Colomer, Pere [1 ]
Calventus, Yolanda [1 ]
Hutchinson, John M. [1 ]
机构
[1] Univ Politecn Cataluna, Escola Super Engn Ind Aeroespacial & Audiovisual, Dept Maquines & Motors Term, Barcelona Tech, Carrer Colom 11, Terrassa 08222, Spain
关键词
hyperbranched polymers; poly(ethyleneimine); epoxy resin; dielectric relaxations; dynamic mechanical relaxations; THERMOPLASTIC-TOUGHENED THERMOSETS; TEMPERATURE-MODULATED DSC; FLAME-RETARDANT COATINGS; URETHANE HYBRID RESINS; DIELECTRIC RELAXATIONS; MECHANICAL-PROPERTIES; THERMOMECHANICAL PROPERTIES; SECONDARY RELAXATIONS; NONISOTHERMAL CURE; LAYERED SILICATE;
D O I
10.3390/ma11030410
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two different commercial hyperbranched poly(ethyleneimine)s (HBPEI), with molecular weights (MW) of 800 and 25,000 g/mol, and denoted as PEI800 and PEI25000, respectively, as well as the mixtures with a Diglycidyl Ether of Bisphenol-A (DGEBA) epoxy resin, have been studied using thermal analysis techniques (DSC, TGA), dielectric relaxation spectroscopy (DRS), and dynamic mechanical analysis (DMA). Only a single glass transition is observed in these mixtures by DSC. DRS of the HBPEIs shows three dipolar relaxations: gamma, beta and alpha The average activation energy for the gamma-relaxation is similar for all HBPEIs and is associated with the motion of the terminal groups. The beta-relaxation has the same average activation energy for both PEI800 and PEI25000; this relaxation is attributed to the mobility of the branches. The alpha-relaxation peak for all the HBPEIs is an asymmetric peak with a shoulder on the high temperature side. This shoulder suggests the existence of ionic charge trapped in the PEI. For the mixtures, the gamma- and beta-relaxations follow the behaviour of the epoxy resin alone, indicating that the epoxy resin dominates the molecular mobility. The alpha-relaxation by DRS is observed only as a shoulder, as a consequence of an overlap with conductivity effects, whereas by DMA, it is a clear peak.
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页数:26
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