同時聚合下製備聚苯乙烯/矽膠高分子混成體

Synthesis of Polystyrene/Silica Gel Polymer Hybrids by in-situ Polymerization Method

陳姿秀(Tzu-Hsiu Chen) ； 蔣孝澈(Shiaw-Tseh Chiang) ； 陳暉(Hui Chen)

《化學》 58卷2期 (2000/06) Pp. 229-239

https://doi.org/10.6623/chem.2000025

摘要

均一透明之聚苯乙烯與矽膠的高分子混成體可藉由同時聚合法製備而得。混成體製備方法為將望苯乙烯單體導入在含有AIBN與TEOS、有機溶劑之溶膠-凝膠反應液中，經混合後在60°C反應，使得矽膠生成時也同時產生聚笨乙烯高分子。本研究探討有機-無機混成體的製備條件，即無機相中酸觸媒的添加量與濃度、水的添加量以及有機相之起始劑用量、溶劑的種類與用量等條件，並探討有機相與無機相之組成比。在適量乙醇或氰甲烷溶劑下，甚至只要添加少許水，就能得到透明之有機-無機混成體。有機-無機混成體的特性是經由GPC與DSC、TGA加以鑑定。當有機-無機混成體為一透明物時，觀察不到其玻璃轉移溫度，可以證明高分子鏈已經均勻分散在不定形之二氧化矽基材中。經由鍛燒後無機物中的孔徑大小(1.4 nm)與表面積(319 m^2/g)、體積(152 mm^3/g)，可判斷出聚苯乙烯是以奈米單位均勻分散在無機相的矽基材中。

關鍵字

聚苯乙烯 ； 四乙氯基矽烷 ； 溶膠-凝膠反應 ； 混成體

並列摘要

Homogeneous polystyrene and silica gel polymer hybrids were prepared by in-situ radical polymerization in sol-gel reaction mixture. Styrene monomer was introduced into a sol-gel reaction mixture of tetraethoxysilane (TEOS) and the polymerization was initiated by 2, 2'-azobisisobutyronitrile (AIBN) at 60℃, while sol-gel reaction of TEOS proceeded to form a silica gel. The preparation conditions, the amount and concentration of acid, the amount of water, AIBN, and solvent, the ratio of St to TEOS, were discussed. The transparent hybrids were obtained even at adding small amount of water by using ethyl alcohol or CH_3CN as solvent. The characterizations of the hybrids were determined by the results of GPC, DSC and TGA. The DSC curve of the transparent hybrids did not show any clear glass transition temperature. This lack of glass transition suggests that the polymer chains are uniformly distributed in the inorganic glass network. The porous silica obtained from the hybrids had high surface area and large pore volume and exhibited pore size 1.4nm. These results indicate that polystyrene was dispersed at a nano-meter level in the silica gel matrix.

並列關鍵字

Polystyrene ； Tetraethoxysilane ； Sol-gel reaction ； Hybrids