Preparation and characterization of the bacterial cellulose/polyurethane nanocomposites

被引：0
作者：
Elaine R. P. Pinto
Hernane S. Barud
Wagner Luiz Polito
Sidney J. L. Ribeiro
Younès Messaddeq
机构：
[1] São Paulo State University-UNESP,Chemistry Institute
[2] São Paulo University-USP,Chemistry Institute
来源：
Journal of Thermal Analysis and Calorimetry | 2013年 / 114卷
关键词：
Bacterial cellulose nanofibers; Polyurethane prepolymer; Nanocomposites;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
New nanocomposites based on bacterial cellulose nanofibers (BCN) and polyurethane (PU) prepolymer were prepared and characterized by SEM, FT-IR, XRD, and TG/DTG analyses. An improvement of the interface reaction between the BCN and the PU prepolymer was obtained by a solvent exchange process. FT-IR results showed the main urethane band at 2,270 cm−1 to PU prepolymer; however, in nanocomposites new bands appear as disubstituted urea at 1,650 and 1,550 cm−1. In addition, the observed decrease in the intensity of the hydroxyl band (3,500 cm−1) suggests an interaction between BCN hydroxyls and NCO-free groups. The nanocomposites presented a non-crystalline character, significant thermal stability (up to 230 °C) and low water absorption when compared to pristine BCN.
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页码：549 / 555
页数：6
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