Weathering degradation of a polyurethane coating

被引：267

作者：

Yang, XF ^{[1
]}

Vang, C

Tallman, DE

Bierwagen, GP

Croll, SG

Rohlik, S

机构：

[1] N Dakota State Univ, Dept Chem, Fargo, ND 58105 USA

[2] N Dakota State Univ, Dept Polymers & Coatings, Fargo, ND 58105 USA

来源：

POLYMER DEGRADATION AND STABILITY | 2001年 / 74卷 / 02期

关键词：

accelerated weathering test; polyurethane degradation; AFM; SEM; XPS; FTIR;

D O I：

10.1016/S0141-3910(01)00166-5

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The degradation of polyurethane topcoat over a chromate pigmented epoxy primer was examined by atomic force microscopy (AFM), scanning electronic microscopy (SEM), X-ray photo-electron spectroscopy (XPS) and Fourier transform infra-red spectroscopy (FTIR) after the coated panels were exposed in a QUV chamber. It was found that upon QUV exposure, blisters formed on the topcoat surfaces during the initial phase of coating degradation. As a result of blister formation and subsequent breakage, coating gloss was lost before any pigments were exposed in the coating. XPS and FTIR analysis indicated that urea and urethane group concentrations increased in the coating upon exposure. It is suggested that the build-up of hydrophilic groups in the coating during coating degradation promoted water absorption into the coating system, then the alternating dry and wet environment caused the formation of osmotic cells and thus blisters on the coating surfaces. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：341 / 351

页数：11

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