Relaxation spectrometry of highly cross‐linked polymer with epoxy lacquer resin base

Abstract

Methods of relaxation spectrometry were used to study mechanical, dielectric and structural relaxations in a highly cross-linked polymer. By application of several mechanical, dielectric and structural (calorimetric) methods, were obtained seven small-scale y-relaxation transition, three small-scale B-transitions and an a-glass transition, divided into two peaks. The most essential characteristics of relaxation processes were calculated. A conclusion about a certain difference between the processes of glass transition in highly cross-linked and in linear polymers is suggested. Relaxationsspektrometrie eines hochvernetzten Polymers auf Epoxynovolakharz-BasisMit der Relaxationsspektrometrie wurden die mechanischen, dielektrischen und strukturellen Relaxationen eines hochvernetzten Polymers untersucht. Durch Anwendung verschiedener mechanischer, dielektrischer und struktureller (calorimetrischer) Methoden wurden sieben y-und drei j3-Relaxationsubergange gefunden, die in kleinen Bereichen erfolgen, sowie ein a-Glasiibergang, der in zwei Maxima unterteilt ist. Die wesentlichen Parameter der Relaxationsprozesse wurden berechnet. Es wurden SchluBfolgerungen iiber den Unterschied des Glasiibergangsprozesses in hochvernetzten und linearen Polymeren abgeleitct. PeJzaiccayuonHtluc cneicmpomempua zycmoculumozo nommepa na ocnoee ~noiccu-~oeo~aunofi cmomiMeTOAaMH peJIaKCaI(HOHHO8 CneKTpOMeTpHH H3YqeHbI MeXaHHYeCKaR, AII3JleKTpHYeCKaR H CTPYKTYPHBR PeJIaKc-CaqHH B ryCTOCtUIITOM IIOJIHMepe. no HaHHbIM HeCKOJIbKHX He3aBHCIIMbIX MeXaHHYeCKHX, a TaKme J(II3JIeKTpH-YeCKOrO II CTPYKTYPHOrO (KaJIOpIIMeTpHYeCKOrO) MeTOAOB 06HapyHteHO CeMb MeJIKOMaCMTa6HbIX y-peJIaKCaqIIOH-PaCCWlTaHbI OCHOBHbIe XaPaKTePHCTHKH peJlaKCaqHOHHbIX IIpOqeCCOB. neJIaeTCf3 BbIBOA 0 HeKOTOPOM OTJIHYHH MeXaHH3MOB CTeKJIOBaHHR B ryCTOCtUHTbIX H JIHHe8HbIX IlO3lHMepaX. H~I X nepexoga, TPK M~J I K O M~C I U T~~H~I X j3-nepexoga H a-npoqecc C T e K n o B a H m , pacIqenneHHbI8 H a EBa nepexoaa.

Relaxation properties of an epoxy polymer plastified with maleic anhydride

“…10-l2 s, c*liaractcristic of flexiblc chnincd lincar and lowly crosslinl\rtl polymers. Standard temprraturc of glass transition for t h r rpox y dian polymer under study (T8 = 102°C) and activation cncrgy ( I 2 1 kJ/mol) differ from t h r morc rigid epoxy lacquer polymer[22] for which T, = 131 "C and U , = 175 I< J/ mol).Above the glass transition rcgion three 1-transitions, which are called so in analogy with 1-transitions in clastomers i n highly viscous state, are obsrrvcd. These transitions are connected with the existence of orderly arranged microregions i n the amorphous phase, playing part of microvolumetrical and polyfunctional physical nodes of a molecular lattice[ O ] .…”