Morphologies and photonic properties of an asymmetric brush block copolymer with polystyrene and polydimethylsiloxane side chains
Morphologies and photonic properties of an asymmetric brush block copolymer with polystyrene and polydimethylsiloxane side chains
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DOI：
10.1016/j.polymer.2018.10.007
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发表时间：
2018-11
期刊：
影响因子：
4.6
通讯作者：
Qian Wang;Kehua Gu;Zhenyu Zhang;Pingping Hou;Zhihao Shen;Xinghe Fan
中科院分区：
文献类型：
--
作者：
Qian Wang;Kehua Gu;Zhenyu Zhang;Pingping Hou;Zhihao Shen;Xinghe Fan
以降冰片烯大分子单体为原料，通过开环歧化聚合合成了具有聚苯乙烯(PS)和聚二甲基硅氧烷(PDMS)侧链的不对称刷状嵌段共聚物(GPS-b-gPDMS)。用小角X射线散射和扫描电子显微镜系统地研究了BBCP的形貌。随着PS体积分数的增加，聚合物自组装成球形、圆柱形和片状结构。由于BBCP大分子的形状不对称，容易形成具有弯曲界面的纳米结构。随着间距的增大，大多数样品会自组装成选择性地反射紫外线的光子晶体。对二维光子晶体的能带结构进行了模拟计算。结果表明，与其他折射率对比度较小的聚合物体系相比，该体系具有较宽的部分带隙。
Asymmetric brush block copolymers (BBCPs) with polystyrene (PS) and polydimethylsiloxane (PDMS) side chains,gPS-b-gPDMS, were synthesized by ring-opening metathesis polymerization of corresponding norbornene macromonomers. The morphologies of the BBCP were systematically investigated with small-angle X-ray scattering and scanning electron microscopy. As the volume fraction of PS increases, the polymer self-assembles into spherical, cylindrical, and lamellar structures. Due to the shape asymmetry of the BBCP macromolecule, nanostructures with curved interfaces are easily formed. With a larged-spacing, most samples self-assemble into photonic crystals that selectively reflect ultraviolet light. Simulations have been conducted to calculate the photonic band structures of the two-dimensional photonic crystals. It is found that this system shows a wider partial band gap than other polymer systems with smaller refractive index contrast.