Glass transition temperatures of microphase-separated semi-interpenetrating polymer networks of polystyrene- inter-poly( cross-2-ethylhexyl methacrylate)

The glass transition temperature of semi-interpenetrating polymer networks (semi-IPNs) of atactic polystyrene (PS) in crosslinked methacrylates was studied by systematic variation of the morphology, that is domain size, continuity and concentration in the domains. Semi-IPNs were prepared from homoge...

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Bibliographic Details
Published in:Polymer (Guilford) 1995, Vol.36 (18), p.3451-3457
Main Authors: de Graaf, Leontine A., Möller, Martin
Format: Article
Language:English
Subjects:
Agrotechnological Research Institute
Applied sciences
Exact sciences and technology
glass transition
Instituut voor Agrotechnologisch Onderzoek
Organic polymers
phase separation
Physicochemistry of polymers
Properties and characterization
semi-IPNs
Thermal and thermodynamic properties
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Summary:The glass transition temperature of semi-interpenetrating polymer networks (semi-IPNs) of atactic polystyrene (PS) in crosslinked methacrylates was studied by systematic variation of the morphology, that is domain size, continuity and concentration in the domains. Semi-IPNs were prepared from homogeneous polymer solutions in a two-step process, of liquid-liquid demixing upon cooling followed by gelation, and subsequent ultra-violet polymerization. Semi-IPNs with very little developed phase separation could be obtained, which exhibited optical transparency and a mechanical behaviour similar to that expected for corresponding homogeneous systems. A low PS concentration inside the domains indicated that these domains consisted of only an interphase layer. Samples that were phase separated to a larger extent showed normal two-phase behaviour.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(95)92015-7