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Mechanical and thermal studies of intercross-linked networks based on siliconized polyurethane-epoxy/unsaturated polyester coatings [Review]

机译:基于硅化聚氨酯-环氧/不饱和聚酯涂料的交联网络的机械和热学研究[综述]

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摘要

Two different intercross-linked networks (ICN) of siliconized polyurethane-epoxy/unsaturated polyester (UP) coatings were developed. Epoxy and UP resins were modified with polyurethane (PU) prepolymer and hydroxyl terminated polydimethylsiloxane (HTPDMS) using -gamma-aminopropyl triethoxysilane (gamma-APS) and vinyltriethoxysilane (VTES) as silane cross-linkers and dibutyltindilaurate (DBTL) as catalyst. Aromatic polyarnine adduct (A) and aliphatic amine (B) were used as curatives; for epoxy and methyl isobutyl ketone peroxide (C) as curative for UP resin. The coating materials were obtained in the form of tough films and characterized for their mechanical properties such as tensile strength and impact test as per ASTM methods. The thermal stability of the ICN coatings was studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) and compared with unmodified epoxy/UP systems. Mechanical properties were enhanced with incorporation of PU (10 wt. %) and silicone (10 wt. %) due to the toughening of brittle epoxy and UP systems. The introduction of PU into unmodified epoxy/UP coating systems reduces the thermal stability due to the presence of thermally weak urethane linkages whereas, the incorporation of 10 wt.% silicone into PU modified epoxy/UP systems improves their thermal stability due to the partial ionic nature, high bond energy and thermal stability of -Si-O-Si- linkage. (C) 2003 Elsevier B.V. All rights reserved. [References: 22]
机译:已开发出两种不同的硅化聚氨酯-环氧/不饱和聚酯(UP)涂层的交联网络(ICN)。使用-γ-氨基丙基三乙氧基硅烷(γ-APS)和乙烯基三乙氧基硅烷(VTES)作为硅烷交联剂,并用二月桂酸二丁基锡(DBTL)作为催化剂,用聚氨酯(PU)预聚物和羟基封端的聚二甲基硅氧烷(HTPDMS)改性环氧树脂和UP树脂。芳族聚酰胺胺加合物(A)和脂族胺(B)用作固化剂;环氧和甲基异丁基甲酮过氧化物(C)用作UP树脂的固化剂。涂层材料以硬质薄膜的形式获得,并根据ASTM方法对其机械性能(如拉伸强度和冲击试验)进行表征。使用差示扫描量热法(DSC)和热重分析(TGA)研究了ICN涂层的热稳定性,并与未改性的环氧/ UP系统进行了比较。由于脆性环氧树脂和UP系统的增韧,通过加入PU(10 wt。%)和有机硅(10 wt。%)增强了机械性能。由于存在弱热的氨基甲酸酯键,将PU引入未改性的环氧/ UP涂料体系中会降低热稳定性,而由于将部分离子化,将10 wt%的有机硅掺入PU改性的环氧/ UP体系中可改善其热稳定性-Si-O-Si-键的性质,高键能和热稳定性。 (C)2003 Elsevier B.V.保留所有权利。 [参考:22]

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