Studies on the Phase Separation of Poly(ether imide)-Modified Epoxy Resin, 5. Phase Separation Behavior of a Quasi-Binary System

Abstract

In this work we present a quasi‐binary system for the study of reaction‐induced phase separation. Differential scanning calorimetry (DSC) shows that the reaction mechanism of epoxy resin cured by C11Z‐CNS imidazole is simple without being affected by the addiction of poly(ether imide) (PEI). The phase structure of interconnected globules was observed by scanning electron microscopy (SEM), and the phase separation is driven by spinodal decomposition as introduced by synchrotron radiation small‐angle X‐ray scattering (SR‐SAXS).

Polymerization-Induced Viscoelastic Phase Separation in Polyethersulfone-Modified Epoxy Systems

“…n gtc ) n p /[(2n p 0 ) 1/2 -1] 2 (8) τ t sr ≈ n p 2 b 2 /(3πkT) (9) τ t pr ≈ ηb 3 n p 3 (φ pr ) R /(kT) (10) phase separation drops into the hydrodynamic regime (τ d > τ ts ) where disentanglement of PES chains occurs in PES-14%. The anisotropic shape of the domain becomes spherical again with the lowest interfacial energy since the interface energy overcomes the elastic energy.…”

Performance of CTBN(carboxyl-terminated poly (butadiene-co-acrylonitrile))-EP(diglycidyl ether of bisphenol-A (DGEBA)) prepolymers and CTBN-EP/polyetheramine (PEA) system

“…Furthermore, the SEM image of sample M 25 (Fig.6f) displayed some difference with samples M 15 and M 20 , one can see uniform globules connected with each other at periodic regulations. This implied that the interconnected globule structure is a kind of co-continuous structure [18] .…”

Polymerization-induced phase separation in polyethersulfone modified epoxy resin systems: effect of curing reaction mechanism

“…As a result, much work has been made to toughen highly crosslinked thermosetting polymers with high modulus, high glass transition temperature thermoplastics, such as polyethersulfone (PES) [1,2] , polysulfone (PSF) [3] , poly (ether ether ketone) (PEEK) [4] and polyetherimide (PEI) [5,6] . Since the mechanical properties of the materials are determined by their final morphologies, much work has been focused on mechanism study of phase separation and morphology control [7][8][9][10][11][12][13] . Effective improvement in toughness can only be obtained at high fractions of the engineering thermoplastic [14,15] , where the thermoplastic forms a continuous phase with the epoxy spherical domain, or the thermoplastic and epoxy form a bicontinuous phase structure.…”