Mechanical properties of simultaneous interpenetrating polymer networks of castor oil based polyurethane and polystyrene

Castor oil and 4,4′-diphenyl methane diisocyanate based polyurethane (PU)-polystyrene (PS) simultaneous interpenetrating polymer networks (IPNs) were synthesized with various PU/PS ratios (100/0, 90/10, 80/20, 75/25, 60/40 and 50/50). Mechanical properties (tensile strength, % elongation, elastic mo...

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Bibliographic Details
Published in:Polymer (Guilford) 1997-08, Vol.38 (17), p.4319-4323
Main Authors: Bai, Susheela, Khakhar, D.V., Nadkarni, V.M.
Format: Article
Language:English
Subjects:
Applied sciences
castor oil
Exact sciences and technology
Mechanical properties
Organic polymers
Physicochemistry of polymers
polystyrene
polyurethane
Properties and characterization
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Summary:Castor oil and 4,4′-diphenyl methane diisocyanate based polyurethane (PU)-polystyrene (PS) simultaneous interpenetrating polymer networks (IPNs) were synthesized with various PU/PS ratios (100/0, 90/10, 80/20, 75/25, 60/40 and 50/50). Mechanical properties (tensile strength, % elongation, elastic modulus, wear resistance, tear resistance and Shore-A hardness) of the IPNs showed a significant improvement beyond a critical styrene level (25% by weight). However, % elongation at break showed a maximum at 40% styrene. PU/PS IPNs of a fixed styrene level with varying amounts of styrene crosslinking agent, divinyl benzene (DVB), were also synthesized. These materials showed a significant improvement in the mechanical properties with increasing concentration of DVB. The observed behaviour is explained on the basis of results from swelling and Soxhlet extraction studies.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(96)01053-1