Fundamental Study on Binary Blends of Thermotropic Semiflexible Polyester and Flexible Polyester

热致半柔性聚酯与柔性聚酯二元共混物的基础研究

• 批准号: 9614929
• 负责人: Chang Han
• 金额: $ 15.99万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-15 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614929&HistoricalAwards=false
• 关键词: Fundamental; Study; Binary; Blends; Thermotropic

SUMMARY CTS-9614929 C.D. Han University of Akron A fundamental study is being conducted on binary blends of main-chain thermotropic semiflexible polyester (MTSP) and flexible polyester. Emphasis will be placed on developing a method(s) whereby an enhancement of the mechanical properties of flexible polyesters can be realized by blending with a MTSP. It is proposed to synthesize a series of MTSP with lateral substitution, and then prepare binary blends with a commercially available flexible polyester, poly(butylene terephthalate) (PBT) or polycarbonate (PC). Using various blends of MTSP and PBT (or PC), which will be prepared during the course of the proposed study, the investigation will include: (1) thermal transitions using differential scanning calorimetry (DSC); (2) equilibrium phase behavior in the nematic region of MTSP using DSC and polarizing optical microscopy; (3) transient/steady-state shear flow and oscillatory shear flow behavior in both the isotropic and nematic regions of MTSP using a cone-and-plate rheometer; (4) the structure in the nematic and solid states, respectively, using variable-temperatures wide-angle X-ray diffractometry; and (5) the mechanical properties of fabricated specimens. The primary objective of the proposed research project is to establish phase behavior-rheology-morphology-property relationships in binary blends consisting of a flexible polyester and a main-chain thermotropic semiflexible polyester (MTSP).

阿克伦大学正在进行主链热致半柔性聚酯（MTSP）与柔性聚酯二元共混体系的基础研究。重点将放在开发一种方法，通过与MTSP混合来增强柔性聚酯的机械性能。提出了通过横向取代合成一系列MTSP，然后与市售的柔性聚酯、聚对苯二甲酸丁二酯（PBT）或聚碳酸酯（PC）制备二元共混物。使用MTSP和PBT（或PC）的各种混合物，将在拟议的研究过程中制备，调查将包括：(1)使用差示扫描量热法（DSC）进行热转变；(2)利用DSC和偏光显微镜研究了MTSP向列相区平衡相行为；(3)利用锥板流变仪研究了MTSP各向同性区和向列区瞬态/稳态剪切流和振荡剪切流行为；(4)采用变温广角x射线衍射法分别对向列态和固态的结构进行了分析；(5)试件的力学性能。提出的研究项目的主要目标是建立由柔性聚酯和主链热致半柔性聚酯（MTSP）组成的二元共混物的相行为-流变-形态-性能关系。