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首页> 外文学位 >Biodegradable poly(hydroxy butyrate-co-valerate) nanocomposites and blends with poly (butylene adipate co-terephthalate) for sensor applications.
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Biodegradable poly(hydroxy butyrate-co-valerate) nanocomposites and blends with poly (butylene adipate co-terephthalate) for sensor applications.

机译：可生物降解的聚（羟基丁酸-共-戊酸酯）纳米复合材料，并与聚（己二酸丁二酯/对苯二甲酸丁二酯）共混，用于传感器应用。

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摘要

The utilization of biodegradable polymers is critical for developing "cradle to cradle" mindset with ecological, social and economic consequences. Poly(hydroxy butyrate-co-valerate) (PHBV) shows significant potential for many applications with a polypropylene equivalent mechanical performance. However, it has limitations including high crystallinity, brittleness, small processing window, etc. which need to be overcome before converting them into useful products. Further the development of biodegradable strain sensing polymer sensors for structural health monitoring has been a growing need. In this dissertation we utilize carbon nanotubes as a self sensing dispersed nanofiller. The impact of its addition on PHBV and a blend of PHBV with poly(butylene adipate-co-terephthalate) (PBAT) polymer was examined. Nanocomposites and blends of PHBV, PBAT, and MWCNTs were prepared by melt-blending. The effect of MWCNTs on PHBV crystallinity, crystalline phase, quasi-static and dynamic mechanical property was studied concurrently with piezoresistive response. In PHBV/PBAT blends a rare phenomenon of melting point elevation by the addition of low melting point PBAT was observed. The blends of these two semicrystalline aliphatic and aromatic polyesters were investigated by using differential scanning calorimetry, small angle X-ray scattering, dynamic mechanical analysis, surface energy measurement by contact angle method, polarized optical and scanning electron microscopy, and rheology. The study revealed a transition of immiscible blend compositions to miscible blend compositions across the 0-100 composition range. PHBV10, 20, and 30 were determined to be miscible blends based on a single Tg and rheological properties. The inter-relation between stress, strain, morphological structure and piezoresistive response of MWCNT filled PHBV and PHBV/PBAT blend system was thoroughly investigated. The outcomes of piezoreistivity study indicated MWCNT filled PHBV and PHBV/PBAT blend system as a viable technology for structural health monitoring. Finally, the compostability of pure polymer, blend system, and MWCNT filled system was studied indicating that PBAT and CNT decreased the biodegradability of PHBV with CNT being a better contributor than PBAT.
机译：利用可生物降解的聚合物对于发展具有生态，社会和经济后果的“从摇篮到摇篮”的思维方式至关重要。聚（羟基丁酸酯-共-戊酸酯）（PHBV）具有与聚丙烯相当的机械性能，在许多应用中显示出巨大潜力。但是，它具有局限性，包括高结晶度，脆性，小的加工窗口等，在将它们转变成有用的产品之前需要克服这些限制。进一步发展了用于结构健康监测的可生物降解的应变传感聚合物传感器的需求日益增长。本文利用碳纳米管作为自感分散纳米填料。考察了其添加对PHBV以及PHBV与聚（己二酸丁二酯-对苯二甲酸对苯二甲酸酯）（PBAT）聚合物的共混物的影响。 PHBV，PBAT和MWCNT的纳米复合材料和共混物是通过熔融共混制备的。同时研究了多壁碳纳米管对PHBV结晶度，晶相，准静态和动态力学性能的影响以及压阻响应。在PHBV / PBAT混合物中，观察到通过添加低熔点PBAT引起的罕见的熔点升高现象。通过使用差示扫描量热法，小角X射线散射，动态力学分析，通过接触角法测量表面能，偏振光学和扫描电子显微镜以及流变学，研究了这两种半结晶脂族和芳族聚酯的共混物。研究表明，在0-100范围内，不混溶的共混物成分向混溶的共混物成分过渡。基于单一的Tg和流变学性质，确定PHBV10、20和30是可混溶的混合物。彻底研究了MWCNT填充的PHBV和PHBV / PBAT共混体系的应力，应变，形态结构和压阻响应之间的相互关系。压阻研究的结果表明，MWCNT填充的PHBV和PHBV / PBAT混合系统是用于结构健康监测的可行技术。最后，研究了纯聚合物，共混体系和MWCNT填充体系的可堆肥性，表明PBAT和CNT降低了PHBV的生物降解性，其中CNT比PBAT更好。

著录项

  • 作者

    Vidhate, Shailesh.;

  • 作者单位

    University of North Texas.;

  • 授予单位 University of North Texas.;
  • 学科 Plastics.;Polymer chemistry.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 217 p.
  • 总页数 217
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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