Synthesis and Self-Assembly of Rod–Rod Block Copolymers with Different Rod Diameters
Synthesis and Self-Assembly of Rod–Rod Block Copolymers with Different Rod Diameters
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DOI：
10.1021/ma4014687
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发表时间：
2013-09
期刊：
影响因子：
5.5
通讯作者：
Feng Zhou;Tieying Ye;Lingying Shi;Changmin Xie;Shankui Chang;Xinghe Fan;Zhihao Shen
中科院分区：
文献类型：
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作者：
Feng Zhou;Tieying Ye;Lingying Shi;Changmin Xie;Shankui Chang;Xinghe Fan;Zhihao Shen
我们合成了一系列不同直径的棒-棒嵌段共聚物poly(octyl-4′-(octyloxy)-2-vinylbiphenyl-4-carboxylate)-b-poly(γ-benzyl-l-glutamate)(PVBP-b-PBLG)，重点研究了尺寸差对其本体自组装行为的影响。利用差示扫描量热仪、广角X射线衍射仪、小角X射线散射仪和电子显微镜等测试手段，发现聚偏二苯醚的柱状向列型液晶相(ΦN)和六方柱状型液晶相(ΦH)随着聚偏氟乙烯的体积分数的不同而不同程度地被破坏。当FPVBP约为60%时，保持了Φ的H相，同时出现了两个二级衍射峰。当fPVBP增加到73%以上时，PBLG的有序结构被破坏，当fPVBP增加到91%时，一级衍射峰也消失了。同时，随着Φ含量的增加，PVBP的N相由无序向有序转变。
We synthesized a series of rod–rod block copolymers, poly(octyl-4′-(octyloxy)-2-vinylbiphenyl-4-carboxylate)-b-poly(γ-benzyl-l-glutamate) (PVBP-b-PBLG) with different rod diameters, and we focused on the effect of size disparity on their self-assembling behaviors in bulk. By using differential scanning calorimetry, wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering, and transmission electron microscopy techniques, we found that the columnar nematic (ΦN) liquid crystalline phase of PVBP and the hexagonal columnar (ΦH) phase of PBLG were disrupted to different extents depending on the volume fractions of PVBP (fPVBP’s). When fPVBP is about 60%, the ΦH phase of PBLG is retained with the appearance of the two second-order diffractions in WAXD patterns. When fPVBP is increased to above 73%, the ordered structure of PBLG is destroyed, and when fPVBP is 91% even the first-order diffraction peak disappears. At the same time, the ΦN phase of PVBP changes from poorly ordered to well ordered with incr...