Technique for Selectively Controlling the Porosity of a Polymeric Material

摘要

A method for selectively controlling the degree of porosity in a polymeric material is provided. The material is formed from a thermoplastic composition containing a microinclusion additive and nanoinclusion additive that are dispersed within a continuous phase of a matrix polymer in the form of discrete domains. At least a portion of the polymeric material is strained so that a porous network is formed therein, Further, at least a portion of the strained polymeric material is heat treated so that it exhibits a Sower pore volume than the material prior to heat treatment, in this manner, the polymeric material can exhibit a high degree of initial flexibility, but this flexibility can be selectively reduced when desired.

主权项

1. A method for selectively controlling the degree of porosity in a polymeric material, wherein the material is formed from a thermoplastic composition containing a microinclusion additive and nanoinclusion additive that are dispersed within a continuous phase of a matrix polymer in the form of discrete domains, and wherein the at least a portion of the polymeric material is strained so that a porous network is formed therein, the method comprising:
heat treating at least a portion of the strained polymeric material, wherein the heat treated material exhibits a lower pore volume than the material prior to heat treatment.