摘要:

AbstractA series of rigid polyurethane foams of densities varying from 65 kg/m−3to 400 kg/m−3have been tested in compression as a function of rate and temperature. Two yield points are observed, the lower one being associated with the surface layers, the higher with the bulk of the material. The yield points may be predicted to a first approximation for the higher density foam using a model based on the buckling of a thinwalled cylin

ISSN:0032-3888    

DOI:10.1002/pen.760140112

出版商:Society of Plastics Engineers, Inc.    

年代:1974

数据来源: WILEY

摘要:

AbstractInterpenetrating polymer networks of the SIN type (simultaneous interpenetrating networks) composed of a polyacrylate and a polyurethane were prepared. They were made by mixing several concentrations of the linear polymer and prepolymer in solution, together with their respective chain extending and crosslinking agents and catalysts, casting films and curing themin situ. The morphology was studied by differential scanning calorimetry and electron microscopy in order to determine the extent of chain entanglement of the two networks (interpenetration). It was found that little or no phase separation occurred, thus implying extensive interpenetration.

ISSN:0032-3888    

DOI:10.1002/pen.760140113

出版商:Society of Plastics Engineers, Inc.    

年代:1974

数据来源: WILEY

ISSN:0032-3888    

DOI:10.1002/pen.760140101

出版商:Society of Plastics Engineers, Inc.    

年代:1974

数据来源: WILEY