一系列二嵌段共聚物,由具有限定长度的软聚二甲基硅氧烷(PDMS)嵌段和液晶聚(6-(4-(4'-氰基苯基偶氮)苯氧基)丙烯酸己酯)(POCN)嵌段组成通过原子转移自由基聚合(ATRP)合成长度。还通过相同的方法制备了均聚物POCN用于比较。然后通过1 H NMR,FT-IR,GPC,UV-Vis,POM,DSC,XRD和TEM研究了聚合物的结构,液晶相,微相分离的形态和光异构化。结果表明,定义明确的二嵌段共聚物(PDMS n - b -POCN m)具有四种不同的软/硬比(n = 58,m= 8、15、24、36)和相对窄的分子分布(PDI≤1.30)。共聚物的POCN嵌段形成近晶A子相,与POCN的同构行为相同。在140℃下在真空下退火24小时后,将共聚物形成层状形态时W¯¯ PDMS是42.3-57.8%和嵌入在偶氮矩阵PDMS球体的形态时W¯¯ PDMS是23.3-31.4%。POCN和PDMS
Several kinds of novel azobenzene-containing tubular polymersomes were fabricated via self-assembly, and their shape could be tuned precisely by changing the chemical structure, self-assembly condition and external stimuli.
Diblock copolymers composed of a liquid crystalline azo block and a poly(dimethylsiloxane) block: synthesis, morphology and photoresponsive properties
作者:Renbo Wei、Yaning He、Xiaogong Wang
DOI:10.1039/c4ra09863c
日期:——
A series of diblock copolymers, composed of a soft poly(dimethylsiloxane) (PDMS) block with a defined length and a liquid crystalline poly(6-(4-(4′-cyanophenylazo)phenoxy)hexyl acrylate) (POCN) block with different lengths, was synthesized by the atom transfer radical polymerization (ATRP). A homopolymer POCN was also prepared by the same method for comparison. The polymer structures, liquid crystalline
一系列二嵌段共聚物,由具有限定长度的软聚二甲基硅氧烷(PDMS)嵌段和液晶聚(6-(4-(4'-氰基苯基偶氮)苯氧基)丙烯酸己酯)(POCN)嵌段组成通过原子转移自由基聚合(ATRP)合成长度。还通过相同的方法制备了均聚物POCN用于比较。然后通过1 H NMR,FT-IR,GPC,UV-Vis,POM,DSC,XRD和TEM研究了聚合物的结构,液晶相,微相分离的形态和光异构化。结果表明,定义明确的二嵌段共聚物(PDMS n - b -POCN m)具有四种不同的软/硬比(n = 58,m= 8、15、24、36)和相对窄的分子分布(PDI≤1.30)。共聚物的POCN嵌段形成近晶A子相,与POCN的同构行为相同。在140℃下在真空下退火24小时后,将共聚物形成层状形态时W¯¯ PDMS是42.3-57.8%和嵌入在偶氮矩阵PDMS球体的形态时W¯¯ PDMS是23.3-31.4%。POCN和PDMS
Polymers containing mesogenic groups and dye radicals in the side chains
申请人:BASF Aktiengesellschaft
公开号:US04631328A1
公开(公告)日:1986-12-23
The polymer chain comprises (a) one or more monomers possessing a nematogenic, chiral or smectogenic group, or a mixture of monomers possessing a nematogenic group with those possessing a chiral group, and (b) one or more monomers possessing a radical of a pleochroic dye, and the nematogenic, the chiral and the smectogenic groups are bonded to the polymerizable group either directly or, like the dye radicals, via a spacer. The polymers can be used, together with low molecular weight liquid crystals or liquid crystal mixtures, in electrooptical displays.