Micellar structure and mechanical properties of block copolymer-modified epoxies

被引：176

作者：

Dean, JM ^{[1
]}

Lipic, PM ^{[1
]}

Grubbs, RB ^{[1
]}

Cook, RF ^{[1
]}

Bates, FS ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2001年 / 39卷 / 23期

关键词：

epoxies; block copolymers; vesicles; fracture toughness; micelles;

D O I：

10.1002/polb.10062

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Amphiphilic block copolymers provide a unique means for toughening epoxy resins because they can self-assemble into different inclusion shapes before epoxy curing. The two examples reported here are spherical micelles and vesicles, which form in blends containing epoxy and symmetric or asymmetric poly(ethylene oxide)-poly-(ethylene-alt-propylene) (PEO-PEP) block copolymer with PEO volume fractions of 0.5 and 0.26, respectively. The vesicles and spherical micelles were characterized by transmission electron microscopy and small-angle X-ray scattering (SAXS), respectively. SAXS data from the spherical micelles were fit to the Percus-Yevick model for a liquid-like packing of spheres with hard-core interactions. Mechanical properties of spherical-micelle-modified and vesicle-modified epoxies in the dilute limit are compared. The glass-transition temperature and Young's (storage) modulus were tested with dynamic mechanical spectroscopy, and compact-tension experiments were performed to determine the critical plane-strain energy release rate for fracture. Vesicles were most effective in improving the epoxy fracture resistance. (C) 2001 John Wiley & Sons, Inc.*.

引用

页码：2996 / 3010

页数：15

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