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首页> 外文期刊>Chemistry: A European journal >High hole mobility for a side-chain liquid-crystalline smectic polysiloxane exhibiting a nanosegregated structure with a terthiophene moiety
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High hole mobility for a side-chain liquid-crystalline smectic polysiloxane exhibiting a nanosegregated structure with a terthiophene moiety

机译：侧链液晶近晶聚硅氧烷的高空穴迁移率，表现出具有噻吩基部分的纳米分离结构

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摘要

Side-chain liquid-crystalline siloxane polymers bearing terthiophene moieties as mesogenic pendant groups have been synthesized. An alkenylterthiophene derivative was treated with poly(hydrogenmethylsiloxane) and poly(dimethylsiloxane-co-hydrogenmethylsiloxane)s in Me_2SiO/MeHSiO ratios of 1:1 and 7:3, respectively, in the presence of the Karstedt catalyst, to produce pale yellow polymers. The degrees of introduction of the mesogenic unit were 100, 50, and 30%, respectively. The polymers exhibit ordered smectic phases at room temperature. The copolymers with dimethylsiloxane units form smectic phases as a consequence of nanosegregation between the mesogenic units and siloxane backbones with the alkylene spacers. Time-of-flight measurement reveals that the hole mobility exceeds 1× 10~(-2)a cm ~2V~(-1)s~(-1) in the ordered smectic phase of the copolymer with a degree introduction of the mesogenic units of 50%. This value is comparable to that of the highly ordered mesophases of low-molecular-weight derivatives of phenylnaphthalene and terthiophene. Because of the segregation behavior induced by the flexible backbone, a closer molecular packing structure favorable for fast carrier transport may be formed in the smectic phase of the copolymer in spite of the low density of the mesogenic groups. Hole-transport polymer: Side-chain liquid-crystalline polysiloxanes bearing terthiophene moieties have been synthesized and exhibit an ordered smectic phase with a nanosegregated structure at ambient temperature (see figure). The hole mobility of the polymer with 50% mesogenic units exceeds 1× 10~(-2)a cm~2V~(-1)s~(-1) at ambient temperature. The nanosegregation promotes a closed molecular packing structure in the smectic phase.
机译：已经合成了带有对噻吩侧基作为介晶侧基的侧链液晶硅氧烷聚合物。在Karstedt催化剂存在下，分别以1：1和7：3的Me_2SiO / MeHSiO比率分别用聚（氢甲基硅氧烷）和聚（二甲基硅氧烷-共-氢甲基硅氧烷）处理烯基对噻吩衍生物，以生产浅黄色聚合物。介晶单元的引入度分别为100％，50％和30％。该聚合物在室温下表现出有序的近晶相。由于介晶单元和具有亚烷基间隔基的硅氧烷主链之间的纳米分离，具有二甲基硅氧烷单元的共聚物形成近晶相。飞行时间测量显示，在一定程度的介晶引入下，共聚物的有序近晶相中空穴迁移率超过1×10〜（-2）a cm〜2V〜（-1）s〜（-1）单位为50％。该值与苯基萘和对噻吩的低分子量衍生物的高度有序的中间相的值相当。由于柔性主链引起的分离行为，尽管介晶基团的密度低，但在共聚物的近晶相中仍可能形成有利于快速载流子传输的更紧密的分子堆积结构。空穴传输聚合物：已经合成了带有对噻吩基部分的侧链液晶聚硅氧烷，并在环境温度下表现出具有纳米偏析结构的有序近晶相（见图）。具有50％介晶单元的聚合物的空穴迁移率在环境温度下超过1×10〜（-2）a cm〜2V〜（-1）s〜（-1）。纳米偏析促进近晶相中的封闭的分子堆积结构。

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