Shear-Induced Conformational Ordering in the Melt of Isotactic Polypropylene

Conformational Ordering in Growing Spherulites of Isotactic Polypropylene

“…The signal of 1303 cm -1 can only be resolved inside the growing spherulite, which is also consistent with the early studies on melt crystallization of iPP with normal FTIR. 27,28 The different spatial distributions of the intensities of 998 cm -1 and 1303 cm -1 bands reflect the distribution of different degrees of orders during the growth of spherulite.…”

Epitaxial Crystallization of Linear Polyethylene in Blends with Isotactic Polypropylene

“…This fact is often explained by the interaction of LPE chains with rows of methyl groups that are situated on the (010) plane of iPP -crystals surfaces since LPE chains can fit well into valleys formed by the methyl groups of iPP [1][2][3][4][5][6][7][8][9][10][11][12][13]. However, we know of only a few reports on the epitaxial growth of LPE on uniaxially oriented iPP [14][15][16].…”

A few rediscovered and challenging topics in polymer crystals and crystallization

“…Based on the above experimental observations, a schematic multi‐scale ordering process for flow‐induced crystallization was proposed by Su et al (see Figure ), which showed a sequential ordering process as the conformational order‐density fluctuation‐preordering‐crystallization. Imposing flow on entangled polymer melts leads to intra‐chain conformational ordering or coil‐helical transition, which has been demonstrated by both theoretical predictions and experimental observations mainly from in‐situ spectroscopic methods . Flow‐induced coil‐helical transition has also been confirmed by molecular dynamic computer simulations .…”