Sugarcane Straw Reinforced Castor Oil Polyurethane Composites: Fiber Characterization and Analysis of Composite Properties

ABSTRACT

This work was concerned with the development of polyurethane (PU) composites reinforced with cellulose fibers attained from sugarcane straw. For the obtainment of cellulose, sugarcane straw was pretreated and delignified. For the production of the PU, the polyol (castor oil) to diisocyanate mass ratio was 1.5:1.0. Reinforcement of the matrix was done, changing the concentration of cellulose fibers (5%, 10%, 15%, and 20% w/w). The efficiency on the obtainment of cellulose fibers was verified by chemical characterization and the fibers morphological aspects by scanning electron microscopy. The influence of fibers content in the composites was studied by thermal analyses, tensile and moisture absorption tests.

摘要

本研究旨在开发用从甘蔗秸秆获得的纤维素纤维增强的聚氨酯（PU）复合材料。为了获得纤维素，需要对甘蔗秸秆进行预处理和脱木素处理。在PU生产中，多元醇（蓖麻油）与二异氰酸酯的质量比为1.5:1.0。在研究中对基质进行了增强且采用不同的纤维素纤维浓度（重量比为5%、10%、15%和20%）。获得纤维素纤维的效率通过化学表征和通过扫描电子显微镜观察的纤维形态学方面进行了验证。通过热分析、拉伸和吸湿试验研究了复合材料中纤维含量的影响。

KEYWORDS:

• castor oil polyurethane
• cellulose
• composites
• natural fibers
• natural polymers

关键词:

• 蓖麻油聚氨酯
• 纤维素
• 复合材料
• 天然纤维
• 天然聚合物

Acknowledgments

Authors are grateful for the research support by CNPq, CAPES, and FAPESP.