Studies on the Phase Separation of Polyetherimide Modified Tetrafunctional Epoxy Resin. II. Effects of the Molecular Weight

Yu, Yingfeng; Cui, Jun; Chen, Weijiong; Li, S. J.

doi:10.1080/10601329808001965

Cited by 18 publications

(7 citation statements)

References 14 publications

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“…Since the mechanical properties of the materials are determined by their final morphologies, much work has been focused on the mechanism study of phase separation and morphology control. − Effective improvement in toughness can only be obtained at high fractions of the engineering thermoplastic, − where the thermoplastic forms a continuous phase with the epoxy spherical domain, or the thermoplastic and epoxy form a bicontinuous phase structure. Thus it is essential to obtain a bicontinuous or phase-inversion morphology in material designing and property control.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2004

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The polymerization-induced phase-separation process of polyethersulfone (PES)-modified epoxy systems was monitored in situ continuously on a single sample throughout the entire curing process by using optical microscopes, time-resolved light scattering (TRLS), scanning electronic microscopes (SEM), and a rheometry instrument. At specific PES content a viscoelastic transformation process of phase inversion morphology to bicontinuous was found with an optical microscope. The rheological behavior during phase separation corresponds well with the morphology development. Light-scattering results monitoring the phase-separation process of systems with final phase inversion morphology show a typical exponential decay procedure of scattering vector qm. The characteristic relaxation time of phase separation can be described well by the WLF equation.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2004

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“…Bucknall [3] has determined cloud point curves of PES/DGEBA blends with PES of different molar mass and found that the miscibility will decrease with PES molar mass. Morphology will also change with the TP molar mass [36] but all these factors seem to have no effect on the values of E a (ps). Figure 5 are curves of lnt ps vs. 1/T for DGEBA/MTHPA/ PES systems with different initiator contents.…”

Section: Effect Of the Phase Separation Detection Methodsmentioning

confidence: 93%

Phase separation time/temperature dependence of some thermoplastics-modified thermosetting systems

Zhang

2008

Front. Chem. China

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The phase separation processes of various thermoplastics-modified thermosetting systems which show upper critical solution temperature (UCST) or lower critical solution temperature (LCST) were studied with emphasis on the temperature dependency of the phase separation times. It was found that the phase separation time-temperature relationship follows the Arrhenius equation. The cure-induced phase separation activation energy E a (ps) generated from the equation is independent of the method used to measure phase separation time. In our experimental ranges it is found that E a (ps) is independent of the thermoplastic (TP) content,TP molecular weight and curing rate but it varies with the cure reaction kinetics and the chemical environments of the systems.

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“…Bucknall [3] has determined cloud point curves of PES/DGEBA blends with PES of different molar mass and found that the miscibility will decrease with PES molar mass. Morphology will also change with the TP molar mass [37] but all these factors seem to bring not much effect on the values of E a (ps).…”

Section: Effect Of Phase Separation Detection Meansmentioning

confidence: 95%

Phase separation time/temperature dependence of thermoplastics-modified thermosetting systems

Zhang

Yi²,

2008

Front. Chem. Eng. China

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The cure-induced phase separation processes of various thermoplastics(TP)-modified thermosetting systems which show upper critical solution temperature (UCST) or lower critical solution temperature (LCST) were studied with emphasis on the temperature dependency of the phase separation time and its potential application in the cure time-temperature processing window. We found that the phase separation time/temperature relationship follows the simple Arrhenius equation. The cure-induced phase separation activation energy E a (ps) generated from the linear fitting of the Arrhenius equation is irrelevant to the detection means of phase separation time. We also found that E a (ps) is insensitive to TP content, TP molecular weight and curing rate, but it changes with the cure reaction kinetics and the chemical environment of the systems. With the established phase separation time-temperature dependence relation, we can easily establish the whole cure time-temperature transformation (TTT) diagram with morphology information which is a useful map for the TP/TS composites processing industry.

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Studies on the Phase Separation of Polyetherimide Modified Tetrafunctional Epoxy Resin. II. Effects of the Molecular Weight

Cited by 18 publications

References 14 publications

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

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

Phase separation time/temperature dependence of some thermoplastics-modified thermosetting systems

Phase separation time/temperature dependence of thermoplastics-modified thermosetting systems

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