纤维素纳米纤维/聚酯树脂复合材料的动态力学和热机械性能。
Dynamic-mechanical and thermomechanical properties of cellulose nanofiber/polyester resin composites.
机构信息
Post-graduate Program in Engineering of Processes and Technologies (PGEPROTEC), Laboratory of Polymers (LPOL), University of Caxias do Sul (UCS), 95070-490 Caxias do Sul, RS, Brazil.
Department of Materials (DEMAT) Federal University of Rio Grande do Sul (UFRGS), BP 15010, 91501-970 Porto Alegre, RS, Brazil.
出版信息
Carbohydr Polym. 2016 Jan 20;136:955-63. doi: 10.1016/j.carbpol.2015.10.008. Epub 2015 Oct 9.
Composites of unsaturated polyester resin (UPR) and cellulose nanofibers (CNFs) obtained from dry cellulose waste of softwood (Pinus sp.) and hardwood (Eucalyptus sp.) were developed. The fiber properties and the influence of the CNFs in the dynamic-mechanical and thermomechanical properties of the composites were evaluated. CNFs with a diameter of 70-90 nm were obtained. Eucalyptus sp. has higher α-cellulose content than Pinus sp. fibers. The crystallinity of the cellulose pulps decreased after grinding. However, high values were still obtained. The chemical composition of the fibers was not significantly altered by the grinding process. Eucalyptus sp. CNF composites had water absorption close to the neat resin at 1 wt% filler. The dynamic-mechanical properties of Eucalyptus sp. CNFs were slightly increased and the thermal stability was improved.
开发了由软木（松树属）和硬木（桉树属）干燥纤维素废料制成的不饱和聚酯树脂（UPR）和纤维素纳米纤维（CNF）复合材料。评估了纤维性能以及 CNF 对复合材料动态力学和热机械性能的影响。获得了直径为 70-90nm 的 CNF。与松树属纤维相比，桉树属纤维具有更高的α-纤维素含量。纤维素浆粕在研磨后结晶度降低，但仍保持较高水平。纤维的化学成分在研磨过程中没有明显改变。桉树属 CNF 复合材料在 1wt%填料时的吸水率接近纯树脂。桉树属 CNF 的动态力学性能略有提高，热稳定性得到改善。
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