Broadband reflection characteristic of polymer-stabilised cholesteric liquid crystal with pitch gradient induced by a hydrogen bond

Broadband reflection characteristic of polymer-stabilised cholesteric liquid crystal with pitch gradient induced by a hydrogen bond
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氢键诱导螺距梯度聚合物稳定胆甾液晶的宽带反射特性

DOI:
10.1080/02678292.2010.501910
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发表时间:
2010-10
期刊:
影响因子:
2.2
通讯作者:
Zhu, Siquan
Zhu, Siquan
中科院分区:
化学3区
文献类型:
--
作者:
Zhang, Lipei;He, Wanli;Yuan, Xiaotao;Hu, Wang;Cao, Hui;Yang, Huai;Zhu, Siquan

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将光聚合丙烯酸酯单体与胆甾液晶(ChLC)混合,通过紫外诱导聚合制备了聚合物稳定胆甾液晶(PSChLC)。在染料沿传播方向吸收紫外光的作用下,形成具有浓度梯度的聚合物网络。在以羧基为质子供体和手性掺杂剂(CD)为质子受体的具有浓度梯度的聚合物网络之间产生的氢键,在PSChLC中引起了一个音高梯度,从而导致了宽带反射。宽带反射与光聚合丙烯酸酯单体的浓度和组成、CD的浓度和聚合温度有关。通过扫描电镜检测聚合物网络的形貌,验证了聚合物网络的螺旋结构和节距梯度,证实了PSChLC的节距梯度,揭示了宽带反射形成的本质。
A polymer-stabilised cholesteric liquid crystal (PSChLC) was fabricated by ultraviolet (UV) induced polymerisation of photopolymerisable acrylate monomers mixed in a cholesteric liquid crystal (ChLC). A polymer network with a concentration gradient, which was induced by UV light absorption of dye along the propagation direction, was formed. A hydrogen bond, arising between the polymer network with a concentration gradient containing carboxyl as proton donors and chiral dopant (CD) as proton acceptors, induced a pitch gradient in PSChLC and then, as a consequence, broadband reflection. The broadband reflection is associated with the concentration and the composition of photopolymerisable acrylate monomers, the concentration of CD and the polymerisation temperature. Examining the morphologies of the polymer network by scanning electron microscopy, the helix structure and pitch gradient were verified, confirming the pitch gradient of the PSChLC and revealing the essence of the formation of broadband reflection.
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