Molecular Weight Dependence of Crystal Growth in Isotactic Polystyrene Ultrathin Films

被引：5

作者：

Taguchi, Ken ^{[1
]}

Miyamoto, Yoshihisa ^{[2
]}

Toda, Akihiko ^{[1
]}

机构：

[1] Hiroshima Univ, Grad Sch Integrated Arts & Sci, 1-7-1 Kagamiyama, Higashihiroshima, Hiroshima 7398521, Japan

[2] Kyoto Univ, Grad Sch Human & Environm Studies, Sakyo Ku, Yoshida Nihonmatsu Cho, Kyoto 6068501, Japan

来源：

ACS MACRO LETTERS | 2019年 / 8卷 / 10期

关键词：

SPHERULITIC GROWTH; CRYSTALLIZATION; VISCOSITY; TEMPERATURE; THICKNESS; MELT; MORPHOLOGY; DIFFUSION; REPTATION; POLYMERS;

D O I：

10.1021/acsmacrolett.9b00516

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In this paper, we report the molecular weight dependence of the crystal growth of isotactic polystyrene from 10 nm ultrathin films. The growth rate and characteristic length of the branching morphology of a crystal grown in 10 nm ultrathin films change depending on the molecular weight of the sample. Analysis of the molecular weight dependence according to the theory of growth front instability reveals that the diffusion coefficient of molecular chains in ultrathin films around branching crystals scales with the molecular weight as M-w(-1.4) for samples with weights higher than the critical molecular weight for the entanglement of polystyrene. This result indicates that the polymer chains in the depletion zone around the crystals diffuse in quasi-two dimensions through the reptational motion modified on an attractive substrate.

引用

页码：1227 / 1232

页数：11

共 48 条

[1] VISCOSITY-MOLECULAR WEIGHT DEPENDENCE FOR SHORT CHAIN POLYSTYRENES [J].