Gradient polymer networks formed by photopolymerization with self-floating polysiloxane-containing nanogel

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• 作者：Cong Chen ; JunYi Han and Fang Sun
• 刊名：Polymers for Advanced Technologies
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：28
• 期：3
• 页码：312-318
• 全文大小：308K
• ISSN：1099-1581

文摘

Polysiloxane-containing nanogels can be used as a fast, convenient and environmentally friendly method to control gradient photopolymerization and to obtain gradient polymer network because of its self-floating feature. The chain length of polysiloxane is a key factor that influences the self-floating capability of the polysiloxane-containing nanogel. This paper reports a series of nanogels compositions synthesized with methacrylate-modified polysiloxanes with different chain lengths, urethane dimethacrylate (UDMA) and isobornyl methacrylate (IBMA) at a molar ratio of 10:20:70 in the presence of a thiol chain transfer agent. The effect of polysiloxane chain length on self-floating capability of the nanogel and gradient polymer network was researched. The results show that polysiloxane chain length is the main driving force for the self-floating capability of the nanogels. The nanogel with long polysiloxane chain length exhibits good self-floating capability in the monomer–polymer matrix because of the lower surface tension of polysiloxane. Furthermore, the gradient polymer network containing the nanogel with long polysiloxane chain length presents lower dispersion surface energy and greater hardness and thermostability. Copyright