Characterization of Surface Accumulation and Release of Nanosilica During Irradiation of Polymer Nanocomposites by Ultraviolet Light

被引：37

作者：

Nguyen, T. ^{[1
]}

Pellegrin, B. ^{[1
]}

Bernard, C. ^{[1
]}

Rabb, S. ^{[1
]}

Stuztman, P. ^{[1
]}

Gorham, J. M. ^{[1
]}

Gu, X. ^{[1
]}

Yu, L. L. ^{[1
]}

Chin, J. W. ^{[1
]}

机构：

[1] NIST, Gaithersburg, MD 20899 USA

来源：

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | 2012年 / 12卷 / 08期

关键词：

Nanocomposite; SiO2; Nanoparticles; Release; Accumulation; Polymer; Surface; UV; Characterization; CARBON NANOTUBES; NANOPARTICLE EMISSION; EPOXY COATINGS; IN-VIVO; TOXICITY; WATER; DEGRADATION; TIO2; PHOTOOXIDATION; MECHANISMS;

D O I：

10.1166/jnn.2012.6442

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Polymer nanocomposites are increasingly used in applications that are subjected to harsh environments. Owing to polymer's susceptibility to photodegradation, nanofillers in a polymer nanocomposite may be released into the environments during the composite's life cycle. Such release potentially poses an environmental health and safety problem and may hinder commercialization of these advanced materials. This study investigated the fate and release of nanosilica from epoxy/nanosilica composites. Specially-designed holders containing nanocomposite specimens were irradiated with UV light in a well-controlled environmental chamber. UV irradiated samples were removed for measurements of polymer chemical degradation, mass loss, surface morphology, nanosilica accumulation on the composite surface, and nanosilica release. Epoxy matrix underwent rapid photodegradation, resulting in substantial accumulation of silica nanofillers on the composite surface and also release from the composite. A conceptual model for surface accumulation and release of nanosilica during UV irradiation of epoxy nanocomposites is presented.

引用

页码：6202 / 6215

页数：14

共 69 条

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