Rigid rod polymers with flexible side chains : synthesis, structure and phase behaviour of poly(3-n-alkyl-4-oxybenzoate)s
Rigid rod polymers with flexible side chains : synthesis, structure and phase behaviour of poly(3-n-alkyl-4-oxybenzoate)s
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具有柔性侧链的刚性棒状聚合物：聚（3-正烷基-4-羟基苯甲酸酯）的合成、结构和相行为
DOI：
10.1016/0032-3861(91)90178-l
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发表时间：
1991
期刊：
影响因子：
4.6
通讯作者：
G. Wegner
中科院分区：
文献类型：
--
作者：
R. Stern;M. Ballauff;Günter Lieser;G. Wegner
报道了n= 3-18的聚（3-n-烷基-4-氧苯甲酸酯）s （PAOB-n）的合成。具有硬链骨架的梳状聚合物具有足够的溶解度，可以测定库恩长度（100-200 Å）。paob -n在n= 3和5内可测定单位细胞。所有paob均为热致性中间相。形成了一个向列相。在form = 5中，有一个从类晶状层状中间相到向列相的过渡。PAOB-nwithn大于或小于6单独形成分层中间期。除form = 3外，所有paob -均向各向同性态跃迁。转变温度随n的增大而单调降低。
The synthesis of poly(3-n-alkyl-4-oxybenzoate)s (PAOB-n) withn= 3–18 is reported. The sufficient solubility of these comb-like polymers with stiff-chain backbones allows the determination of the Kuhn length (100–200 Å). The unit cells could be determined for PAOB-nwithn= 3 and 5. All PAOB-nform thermotropic mesophases. Forn= 3 a nematic phase is found. Forn= 5 there is a transition from a smectic-like, layered mesophase to a nematic mesophase. PAOB-nwithn⩾ 6 solely form layered mesophases. Except forn= 3, all PAOB-nexhibit a transition to the isotropic state. The transition temperature is lowered monotomically with increasingn.