双羟基四配位硅不饱和聚酯树脂的合成及性能

以无定形二氧化硅为起始原料,与乙二醇、氢氧化钾反应,生成高反应活性的五配位硅钾化合物,以此为原料与含活泼氯的2-氯乙醇反应,制备出双羟基四配位硅单体。然后用该单体与马来酸酐(MA)、1-2丙二醇反应制备出线性不饱和聚酯的预聚体,再与苯乙烯进行自由基聚合得到共聚物,并对所合成的共聚物进行了红外光谱、热重分析等结构表征与性能分析。红外光谱表明,3 377 cm-1是端O—H的振动吸收峰,3 128 cm-1是C—H的伸缩振动吸收峰,1 728 cm-1是C=O的振动吸收峰,1 067cm-1是Si—O—C的振动吸收峰,866 cm-1是Si—O—C的面外弯曲振动吸收峰。热重分析表明,由于硅的引入,配位硅改性树脂耐热性比未改性树脂提高了近20℃左右;配位硅改性树脂的洛氏硬度比未改性树脂提高了1.5倍;改性后树脂的吸水率比未改性树脂低50%左右。

Synthesis and Properties of Unsaturated Polyester Resin Modified by Di-hydroxy Tetracoordinated Silicon

A highly reactive penta-coordinated organic silicon complex was prepared by means of the reaction of silica with ethylene glycol and potassium hydroxide.Then the di-hydroxy tetracoordinated silicon by the reaction of ClCH2CH2OH with penta-coordinated silicon complex was synthesized.Besides,the prepolymer of linear unsaturated polyester was prepared with the reaction of maleicanhydride and di-hydroxy tetracoordinated silicon,and the copolymer with styrene was synthesized by the free radical polymerization.The structure and properties of polymer were characterized by the FTIR,and TG,etc.The IR indicated(KBr,cm-1): ν-OH,3 377;νC-H,3 128;νC=O,1 728;νSi-O-C,1 067 and 866.TG analysis showed that the thermal stability of the modified unsaturated polyester was increased 20 ℃ higher than that of the no-modified unsaturated polyester,because of the introduction of silicon;the HK hardness of the modified unsaturated polyester was increased 1.5 times compared to that of the no-modified unsaturated polyester;the water resistance was decreased one times lower than that of the no-modified unsaturated polyester.