Patent ID: 9605116
Date: 2017-03-28
CPC Classifications: B29C,B32B,C08F,C08J,Y10T

Claim:
1. A method for secondary-molding a polymer nano oriented crystal material, comprising the steps of: (1) providing a polymer nano oriented crystal material by (i) elongating a polymer melt at an elongation strain rate not slower than a critical elongation strain rate, to thereby obtain an oriented polymer melt and (ii) crystallizing the oriented polymer melt; (2) heating the polymer nano oriented crystal material so that the polymer nano oriented crystal material changes into a melt having a dense entanglement network structure; (3) molding the polymer nano oriented crystal material which changed into the melt having the dense entanglement network structure in the step (2); and (4) cooling the polymer nano oriented crystal material, which has undergone the step (3), under a restrained condition, until the polymer nano oriented crystal material changes into an ordered phase, wherein the restrained condition is a condition under which the melt having a dense entanglement network structure is restricted to make no volume change, the polymer nano oriented crystal material comprises polymer nano oriented crystals having a crystal size d of not more than 300 nm and an orientation function f the polymer nano oriented crystal material comprises a cylindrical high order structure, and the cylindrical high order structure comprises a bundle of strings each of which is constituted by nano oriented crystal particles connected together.