Liquid Crystalline Behaviors of Chitin Nanocrystals and Their Reinforcing Effect on Natural Rubber,ACS Sustainable Chemistry & Engineering

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Liquid Crystalline Behaviors of Chitin Nanocrystals and Their Reinforcing Effect on Natural Rubber
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-11-14 00:00:00 , DOI: 10.1021/acssuschemeng.7b02586
Yongwang Liu ₁ , Mingxian Liu ₁ , Shuyan Yang ₂ , Binghong Luo ₁ , Changren Zhou ₁

Affiliation

Chitin nanocrystals (CNCs), rod-like crystalline nanoparticles from natural sources, show high aspect ratio, high modulus, and excellent reinforcing ability toward polymers. In this study, CNCs aqueous dispersions were first prepared by acid hydrolysis of raw chitin. The resulting dispersion was investigated by polarized optical microscopy and rheometry at different CNCs concentrations. A nematic liquid crystals phenomenon with increasing solid concentration is found in the CNCs dispersion. When the concentration of CNCs dispersion is beyond 5 wt %, the dispersion forms liquid crystal phase. CNCs dispersions were then compounded with natural rubber (NR) latex to prepare NR/CNCs composites. CNCs are evenly dispersed in NR matrix, which can effectively enhance the mechanical properties and thermal stability of rubber. The tensile strength of NR/CNCs composite containing 10 wt % CNCs is 5.75 MPa, which is 6.25 multiples of pure NR. Also, the tear strength, storage modulus, and thermal decomposition temperature of the composites increase with increasing CNCs loading. The improvement of NR properties is caused by the uniformly dispersed CNCs and the good interfacial interactions between CNCs and rubber molecular chains. NR/CNCs composites show many advantages such as light color, lightweight, and high performance over the traditional carbon black-filled rubber.

中文翻译：

几丁质纳米晶体的液晶行为及其对天然橡胶的增强作用

几丁质纳米晶体（CNC）是自然来源的棒状晶体纳米颗粒，具有高的长宽比，高的模量和对聚合物的出色增强能力。在这项研究中，CNCs水分散体首先通过未加工的几丁质酸水解制备。通过偏振光学显微镜和流变术在不同的CNCs浓度下研究所得的分散体。在CNC分散液中发现了一种随着固形物浓度增加而向列相的液晶现象。当CNC分散体的浓度超过5重量％时，分散体形成液晶相。然后将CNCs分散体与天然橡胶（NR）胶乳混合，以制备NR / CNCs复合材料。CNCs均匀分散在NR基质中，可有效增强橡胶的机械性能和热稳定性。包含10 wt％CNCs的NR / CNCs复合材料的拉伸强度为5.75 MPa，是纯NR的6.25倍。而且，复合材料的撕裂强度，储能模量和热分解温度会随着CNC载荷的增加而增加。NR性能的改善是由于CNC分散均匀以及CNC与橡胶分子链之间的良好界面相互作用所致。与传统的炭黑填充橡胶相比，NR / CNCs复合材料具有许多优点，例如颜色浅，重量轻和性能高。NR性能的改善是由于CNC分散均匀以及CNC与橡胶分子链之间的良好界面相互作用所致。与传统的炭黑填充橡胶相比，NR / CNCs复合材料具有许多优点，例如颜色浅，重量轻和性能高。NR性能的改善是由于CNC分散均匀以及CNC与橡胶分子链之间的良好界面相互作用所致。与传统的炭黑填充橡胶相比，NR / CNCs复合材料具有许多优点，例如颜色浅，重量轻和性能高。

更新日期：2017-11-15

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