中文摘要：

以手性化合物n-癸基-（S）-（＋）-2-甲基丁基二氯硅烷（Si1）和非手性化合物n-癸基-2-乙基丁基二氯硅烷（Si2）为单体合成了聚硅烷共聚物[P（Si1-co-Si2）]．通过改变Si1和Si2的投料比，聚合得到一系列P（Si1—co—Si2）．通过核磁表征P（Si1—CO-Si2）为无规共聚物．利用圆二色谱（CD）和紫外吸收光谱研究系列共聚物的手性传递行为．研究发现，Si2的均聚物在其对应的紫外吸收带324nm处没有CD信号．当加入Si1共聚后，产生CD信号，随着Si1含量的增加，共聚物的CD信号迅速增强，当Si1摩尔分数为2％时可诱导共聚物形成单手螺旋优势构象．当Sil含量达到70％时，信号强度最大．在P（Si1—co-Si2）中Si1含量增加的过程中，共聚物的紫外吸收带同时发生蓝移．当Si1含量达到50％时，分子量较低的样品具有较强的光学活性，并且随着分子量的增大，紫外吸收红移．研究结果初步表明，聚硅烷共聚物的螺旋结构由手性侧基决定，但非手性侧基的奇偶性却没有体现．

英文摘要：

Si1ane copolymers [ P （ Si1-co-Si2 ） ] were synthesized using （S） -2-methylbutyl-n-decyldichlorosilane （ Si1 ） and 2-ethylbutyl-n-decyldichlorosilane （ Si2 ） monomers. A series of P （ Si1-co-Si2 ） was synthesized by varying the ratio of Si1 and Si2. The random copolymer was confirmed by nuclear magnetic resonance. The chirality transfer behaviour of polysilan ultraviolet absorption spectrum （UV） e samples was characterized by circular dichroism spectrum （CD） and It was found that homopolymer of achiral monomer Si2 exhibited no CD signal, but intense and sharp UV absorption at 324 nm. When the chiral monomer Si1 was added into the main chain of polymer molecules, the obtained copolymer molecules were induced with a marked CD signal When the mole fraction of Si1 increased, the intensity of CD signal became higher rapidly, even as little as 2.0% （molar fraction） of enantiopure Si1 could induce a marked single-handed helical conformation in these copolymers. After that, the intensity of CD signal increased slightly and then decreased slightly. Moreover, the λmax value tended to blueshift progressively with increasing the molar fraction of the chiral moiety in the copolymers. For P（Si1-co-Si2） of 50% Si1 （P50） with diffierent molecular weight, the λmax tended to redshift with increasing molecular weight, and the lower molecular weight P50 possessed a stronger optical activity. The result indicated that the handedness of the copolymers was controlled by the chiral alkyl chain and the odd-even effect of the achiral alkyl chain was not reflected.