Tailoring the morphology and properties of waterborne polyurethanes by the procedure of cellulose nanocrystal incorporation

被引:48
作者
de Oliveira Patricio, Patricia Santiago [1 ]
Pereira, Iaci Miranda [2 ]
Ferreira da Silva, Natalia Cristina [1 ]
Ayres, Eliane [3 ]
Pereira, Fabiano Vargas [4 ]
Orefice, Rodrigo Lambert [5 ]
机构
[1] Ctr Fed Educ Tecnol Minas Gerais, BR-30421169 Belo Horizonte, MG, Brazil
[2] Ctr Pesquisa Exercito, Rio De Janeiro, RJ, Brazil
[3] Univ Estado Minas Gerais, BR-31270010 Belo Horizonte, MG, Brazil
[4] Univ Fed Minas Gerais, Dept Quim, BR-31270901 Belo Horizonte, MG, Brazil
[5] Univ Fed Minas Gerais, Dept Engn Met & Mat, BR-31270901 Belo Horizonte, MG, Brazil
关键词
Polyurethane waterborne; Cellulose nanocrystals; Small angle X-ray scattering; Mechanical properties; REINFORCEMENT; POLYETHYLENE; ELASTOMER; MEMBRANES;
D O I
10.1016/j.eurpolymj.2013.08.006
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polyurethane waterborne synthesis was performed using a two-step method, commonly referred to as a prepolymer method. Nanocomposites based on waterborne polyurethane and cellulose nanocrystals were prepared by the prepolymer method by altering the mode and step in which the nanofillers were incorporated during the polyurethane formation. The morphology, structural, thermal, and mechanical properties of the resulting nanocomposite films were evaluated by Fourier transform infrared spectroscopy (FTIR), small angle X-ray scattering (SAXS), scanning electron microscopy (SEM), and tensile tests. FTIR results indicated that the degree of interaction between the nanofillers and the WPU through hydrogen bonds could be controlled by the method of cellulose nanocrystal incorporation. Data obtained from SAXS experiments showed that the cellulose nanocrystals as well as the step of the reaction in which they are added influenced the morphology of the polyurethane. The reinforcing effect of CNCs on the nanocomposites depends on their morphology. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3761 / 3769
页数:9
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