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Structure property relationships in various layered polymeric systems.

机译：各种层状聚合物系统中的结构特性关系。

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摘要

Layered polymeric structures made via forced assembly have shown unique optical, mechanical, electrical and barrier properties. The advantages include the flexibility of the process in scaling from macro to nano scale; and the ability to incorporate electrically/optically active small molecules.; Excellent control over the cell size is demonstrated in PP foam/film structures. Cell size can be reduced considerably by increasing the number of layers without adversely affecting the density. The cell structure and the compressive response of these structures is similar to Cork. The tensile and compressive moduli could be predicted using series and parallel composite models. The constituent materials can be chosen to alter the flexibility of the composite.; Narrowband 1D photonic crystals have been fabricated using microlayer coextrusion. Assemblies of 128 alternating polystyrene and polymethyl methacrylate layers were successfully made that demonstrated the tuning of the photonic band gap. The structural perfection of the photonic crystals was evaluated via model simulations and atomic force microscopy.; Alternate layers of a 1D photonic crystal could be doped with an optical limiting dye and{09}scaling of the layers could be adjusted so as to enhance the optical limiting effect with the layer reflectivity. A prerequisite for this is achieving dispersion of dye molecules in the monomer form. Aggregation studies of PbPc(beta-CP)4 were carried out with blends in polycarbonate using the UV-VIS spectroscopy. An attractive feature of the polycarbonate blends is the high concentration of monomer. The concentration effect is satisfactorily described by the monomer/dimer equilibrium.; Solid state structure of these blends was probed. In the concentration range 0 to 0.1%, monomer fills up large free volume holes in polycarbonate, as indicated by the sharp increase in density and refractive index. Between 0.1 to ∼8%, PbPc(beta-CP)4 is mostly in monomer form. Monomer "antiplasticizes" polycarbonate, resulting in reduced glass transition temperature, increased modulus and suppression of the sub-Tg gamma relaxation for polycarbonate. The refractive index-density relationship can be described by the Lorenz-Lorenz equation. Above ∼ 8 %, formation of aggregates is detected. The densification of the blends are attributed to the combined effect of reduction in free volume; and the addition of PbPc(beta-CP) 4.
机译：通过强制组装制成的层状聚合物结构具有独特的光学，机械，电和阻隔性能。优点包括从宏观尺度到纳米尺度的过程灵活性；以及结合电/光活性小分子的能力。 PP泡沫/薄膜结构证明了对泡孔尺寸的出色控制。可以通过增加层数来显着减小像元大小，而不会不利地影响密度。细胞结构和这些结构的压缩反应类似于软木。拉伸模量和压缩模量可以使用串联和并联复合模型进行预测。可以选择组成材料以改变复合材料的柔韧性。窄带一维光子晶体已经使用微层共挤出法制造。成功制造了128个交替的聚苯乙烯层和聚甲基丙烯酸甲酯层，从而证明了光子带隙的调谐。通过模型模拟和原子力显微镜评估光子晶体的结构完善性。一维光子晶体的交替层可以掺杂有光学限制染料，并且可以调整各层的{09}结垢，从而利用层反射率增强光学限制效果。为此的前提条件是使染料分子以单体形式分散。使用UV-VIS光谱法对聚碳酸酯中的共混物进行了PbPc（β-CP）4的聚集研究。聚碳酸酯共混物的一个吸引人的特征是高浓度的单体。单体/二聚体平衡令人满意地描述了浓度效应。探索了这些共混物的固态结构。如浓度和折射率的急剧增加所示，在浓度范围为0至0.1％的范围内，单体会填充聚碳酸酯中的大自由体积孔。在0.1至约8％之间，PbPc（β-CP）4主要为单体形式。单体“抗塑化”聚碳酸酯，导致降低的玻璃化转变温度，增加的模量并抑制聚碳酸酯的亚Tgγ弛豫。折射率-密度关系可以通过洛伦兹-洛伦茨方程来描述。高于〜8％时，检测到聚集体的形成。共混物的致密化归因于减少自由体积的综合作用。并添加PbPc（beta-CP）4。

著录项

  • 作者

    Ranade, Aditya Prakash.;

  • 作者单位

    Case Western Reserve University.;

  • 授予单位 Case Western Reserve University.;
  • 学科 Plastics Technology.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 169 p.
  • 总页数 169
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 整形外科学（修复外科学）;
  • 关键词

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