硅基上金粒子诱导的聚氧硅烷纳米线的合成

采用液相法以硅基上原位合成的金纳米粒子作为催化剂和模板,在不同的反应条件下,用十八烷基硅烷（Octadecylsilane）作为前驱体合成了纳米线状化合物．研究了不同反应条件对该线状化合物形貌的影响,能量散射光谱实验结果表明该线状化合物为聚氧硅烷,扫描电镜结果显示当反应温度控制在110℃和反应时间90min的条件下,可得到均匀的纳米线状化合物．最后提出了聚氧硅烷化合物可能的形成机理,同时也为制备硅基上的硅氧纳米线状化合物提供了一种方便而简单的方法．     

Synthesis of Polyacrylate／Polysiloxane Copolymer and Its Damping Performance

The copolymer of polyacrylate/polysiloxane for vibration damping materials was synthesized through emulsion polymerization. The effects of the amount of methyl methaerylate (MMA),polysiloxane containing vinyl, initiator and emulsifier on the conversion, stability of polyacrylate/polysiloxane emulsion were discussed when the emulsion was prepared by pre-emulsifying half continuous method. The graft copolymer has good vibration damping performance. The widest glass transition region of the copolymer spans 100℃, and the highest value of tan8 reached 2.0. The glass transition of the samples was examined by dynamic mechanical analysis (DMA). The vibration damping performance of the graft copolymer was affected by the amount of poly-vinyl dimethylsiloxane (PVMS).     

脱氢型室温硫化硅橡胶的研究

考察了端羟基聚有机硅氧烷、补强填料和含氢硅油的种类对脱氢型室温硫化(RTV)硅橡胶的力学性能和粘接性能的影响,以及催化剂种类对RTV硅橡胶的凝胶时间和表观密度的影响。结果表明,当端羟基聚二甲基硅氧烷和端羟基聚甲基苯基硅氧烷按10∶3的质量比并用时,RTV硅橡胶的剪切强度较高;当侧氢基硅油和端氢基硅油按1∶1~1∶3的质量比配合使用时,能明显改善硅橡胶的剪切强度;通过选择适当的催化剂,可调整脱氢型硅橡胶的凝胶时间,制得较致密的硫化胶;二氧化钛、氧化锌对脱氢型RTV硅橡胶均有补强作用,而经甲基三乙氧基硅烷处理的氧化锌对脱氢型RTV硅橡胶的补强作用最明显。     

氨基长链烷烃共改性聚硅氧烷的合成

以α-蒎烯、甲基二氯硅烷、氯铂酸、甲醇、八甲基环四硅氧烷、N-β-氨乙基-γ-氨丙基甲基二甲氧基硅烷等为原料,通过硅氢加成反应、醇解反应和碱催化共聚反应合成了氨基蒎基改性聚硅氧烷。甲基二氯硅烷与α-蒎烯进行硅氢加成反应较佳的反应条件为反应温度80℃,甲基二氯硅烷与α-蒎烯的量之比1.1∶1,反应时间6h;采用石油醚为溶剂去除醇解反应产生的HCl。     

Synthesis and characterization of side‐chain liquid‐crystalline ionomers containing quaternary ammonium salt groups

A series of thermotropic side‐chain liquid‐crystalline ionomers (LCIs) containing 4‐(4‐alkoxybenzyloxy)‐4′‐allyloxybiphenyl (M) as mesogenic units and allyl triethylammonium bromide (ATAB) as nonmesogenic units were synthesized by graft copolymerization upon polymethylhydrosiloxane. The chemical structures of the polymers were confirmed by IR spectroscopy. DSC was used to measure the thermal properties of these polymers. The mesogenic properties were characterized by polarizing optical microscopy, DSC, and X‐ray diffraction. Homopolymers without ionic groups exhibit smectic and nematic mesophases. The nematic mesophases of the ionomers disappear and the mesomorphic temperature ranges decrease with increasing concentration of ionic units. The influence of the alkoxy chain length on clearing temperature (T_c) values of ionomers clearly shows an odd‐even effect, similar to that of other side‐chain liquid‐crystalline polymers. The mesomorphic temperature ranges increase with increasing alkoxy chain length when the number of alkoxy carbon is over 3. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2879–2886, 2003     

低黄变和亲水性氨基聚硅氧烷的开发

概述了氨基聚硅氧烷的发展历程、特点及发展趋势,着重介绍了氨基聚硅氧烷的黄变机理,低黄变氨基聚硅氧烷、亲水性氨基聚硅氧烷的开发,以及氨基聚硅氧烷的生态环保性。     

嵌段型氨基聚醚改性硅油的合成、膜形貌与应用性能

利用乙二胺与环氧基聚醚封端后的聚二甲基硅氧烷在一定条件下合成了一种新型嵌段型氨基聚醚改性硅油(APES),用红外光谱(IR)、核磁共振氢谱(1 H-NMR)对APES的结构进行了表征,用原子力探针显微镜(AFM)等仪器研究了膜形貌及应用性能.结果表明,在单晶硅表面,新合成的APES能够形成微观形态学非均一结构的硅膜,其膜形貌主要由不清晰的连续相与大小不同的微小凸起构成.用APES处理棉纤维织物,能使织物的折皱回复角增大、弯曲刚度明显降低、织物的静态吸水时间仅有3.2s.     

三硅氧烷表面活性剂

介绍了三硅氧烷表面活性剂的结构、合成、性能和应用。     

高分子硅烷偶联剂改性环氧树脂性能研究

采用侧链氨基硅油(AEAPS)和小分子偶联剂KH-560为原料合成了一系列氨基硅油高分子偶联剂(APCA)并用作双酚A型环氧树脂(EP)/4,4′-二氨基二苯基甲烷(DDM)体系的改性剂,系统研究了改性剂含量等对改性环氧固化物的冲击强度、拉伸强度、断裂伸长率、玻璃化转变温度(Tg)和断裂面形态等的影响。结果表明,APCA能明显提高固化体系的性能,其中环氧树脂经10份APCA-60改性后,与未改性环氧相比,抗冲强度提高了近一倍,断裂伸长率增加了94.55%,拉伸强度也提高了59.55%,而Tg也提高了5℃,达到了明显的增强增韧和提高耐热性等效果。     

聚硅氧烷表面改性聚磷酸铵的制备及阻燃应用

以正硅酸乙酯(TEOS)及3-氨基丙基三乙氧基硅烷(ATOS)为原料,采用溶胶-凝胶法对聚磷酸铵(APP)进行了表面改性并用于阻燃环氧树脂。结果表明:TEOS及ATOS通过水解、聚合反应在改性APP(MAPP)表面生成了一层致密且类似荷叶表面微-纳米结构的聚硅氧烷膜,MAPP的溶解度由0.62降低为0.18 g/100 m L水,疏水性及耐水性明显增强。