ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Cardanol-formaldehyde (CF) resins (both novolac and resol) and CF-poly(methylmethacrylate) (PMMA) semi-interpenetrating polymer networks were synthesized and their mechanical properties and thermal transitions were evaluated. The lower tensile strength of CF resins compared to phenol-formaldehyde (PF) resins may be understood on the basis of the structure of the C15 side chain imparting steric hindrance and reduction in intermolecular interactions. Interpenetration of CF with PMMA increased the mechanical properties only marginally. Scanning electron micrographs of the semi-IPNs showed two distinct phases. Thermomechanical analysis gave two glass transition temperatures,T g, for the IPNs, the lowerT g corresponding to the PMMA phase and the higherT g to the CF phase. However, the unusual increase inT g of the CF from 128°C to 144°C suggests restrictions in the segmental motion of the CF phase brought about by mixing with another rigid polymer such as PMMA.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00553482
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