Effect of crosslink density on the refractive index of a polysiloxane network based on 2,4,6,8-tetramethyl-2,4,6, 8-tetravinylcyclotetrasiloxane

被引:36
作者
Tyng, Looi Yien [1 ]
Ramli, Mohamad Riduwan [1 ]
Othman, Muhammad Bisyrul Hafi [1 ]
Ramli, Rafiza [1 ,3 ]
Ishak, Zainal Arifin Mohd [1 ,2 ]
Ahmad, Zulkifli [1 ]
机构
[1] Univ Sains Malaysia, Sch Mat & Minerals Engn, Nibong Tebal 14300, Pulau Pinang, Malaysia
[2] Univ Sains Malaysia, Nibong Tebal 14300, Pulau Pinang, Malaysia
[3] Penchem Technol Sdn Bhd, George Town, Malaysia
关键词
polysiloxane; crosslink network; refractive index; Lorentz-Lorenz relationship; SILOXANE COPOLYMERS; OXYCARBIDE GLASSES; SILSESQUIOXANE; POLYMERS; BEHAVIOR; FILMS;
D O I
10.1002/pi.4315
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Crosslink density is one of the factors which dictate the optical and mechanical properties of silicone-based polymers. A series of hydrosilyl-terminated polydimethylsiloxane cured with 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane was prepared to form a crosslink network. They were clear gel forms whose elastomeric features were dependent on the end-capper concentration, 1,1,3,3-tetramethyldisiloxane, employed during their synthesis. The siloxane-based polymers displayed excellent thermal stability whose decomposition temperature was around 480 degrees C. The refractive index was in the range 1.4101.425. It was found that the refractive index is dependent on the crosslink density of the network. The effect of fractional free volume and densification' of the network was elucidated and found to contribute to this dependence. The LorentzLorenz model was used to integrate these observations. (c) 2012 Society of Chemical Industry
引用
收藏
页码:382 / 389
页数:8
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