期刊
CELLULOSE
卷 20, 期 5, 页码 2569-2582出版社
SPRINGER
DOI: 10.1007/s10570-013-0008-2
关键词
Cellulose nanocrystals; Whiskers; Liquid crystalline thermoset; Birefringence; Epoxy nanocomposite; Lyotropic liquid crystals
资金
- Aalto University
- Academy of Finland [137759]
- Academy of Finland (AKA) [137759, 137759] Funding Source: Academy of Finland (AKA)
A new class of liquid crystalline thermosets (LCTs) was successfully produced containing lyotropic cellulose nanocrystals (CNCs) as the primary mesogenic component (up to 72 wt%) by the addition of non-mesogenic epoxy monomers. Cellulose-based LCTs were produced by totally aqueous processing methods and ultimately cured at elevated temperatures to produce ordered networks of 'frozen' liquid crystalline (LC) phases. Various degrees of birefringence were obtained via self-assembly of CNCs into oriented phases as observed by polarized optical microscopy and transmission electron microscopy. X-ray diffraction measurements highlighted the effects of texture of CNCs within LCT films compared to lyophilized CNCs. Cellulose-based LCT films uniquely exhibited thermo-mechanical properties of both traditional LCTs and LC elastomers, such as high elastic modulus (similar to 1 GPa) under ambient conditions and low glass transition temperature (similar to-25 A degrees C), respectively. The development of LCTs based on CNCs and aqueous processing methods provides a renewable pathway for designing high performance composites with ordered network structures and unique optical properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据