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

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.     

Borassus and Tamarind Fruit Fibers as Reinforcement in Cashew Nut Shell Liquid-Epoxy Composites

In this study borassus and tamarind fruit fibers were extracted and their physical and mechanical properties such as diameter, density, tensile strength and interfacial adhesion strength (IAS) were experimentally determined. To study the effect of alkali treatment, both the fruit fibers were treated with 5% vol. sodium hydroxide solution for 0.5 h, 1 h, 2 h, and 4 h durations. Morphological studies of untreated and alkali treated fibers by using scanning electron microscope (SEM) revealed the presence of the surface impurities on the untreated fiber whereas the same were absent on the treated fibers. Fourier transform infrared spectrometry (FTIR) and X-ray diffraction (XRD) analysis also confirmed the elimination of amorphous hemicellulose of the fibers on treatment. Borassus fruit fine fibers and tamarind fruit fibers treated for 2 h exhibited better mechanical properties and improved IAS with Cashew Nut Shell Liquid (CNSL) -Epoxy matrix.     

A Review: Nanomaterials as a Filler in Natural Fiber Reinforced Composites

Composite reinforcement is defined as a technique to improve the engineering characteristics of composite and a fiber reinforced composite (FRC) is a composite material consisting of a polymer matrix imbedded with high-strength fibers, synthetic fibers or natural fibers. Natural fibers have recently become attractive to researchers, engineers, and scientists as an alternative reinforcement for FRCs. Nanocomposite shows considerable applications in different fields because of larger surface area, and greater aspect ratio, with fascinating properties. Being environmentally friendly, applications of nanocomposites offer new technology and business opportunities for several sectors, such as aerospace, automotive, electronics, and biotechnology industries. Hybrid bio-based composites that exploit the synergy between natural fibers in a nanoreinforced bio-based polymer can lead to improved properties along with maintaining environmental appeal. This review article intended to investigate natural fiber/nanofiller-based hybrid composite with specific concern to their physical and mechanical properties.     

Lyocell纤维增强塑料复合材料

纤维素纤维Lyocell纤维是生态复合材料增强组分的一种可选材料。本文的目的是阐述Lyocell纤维作为塑料增强组分的特性及其应用可能性。     

纳米材料在改性水性聚氨酯中的研究进展

综述了纳米材料在水性聚氨酯中的应用现状,以及与该类水性聚氨酯的作用和合成方法。着重介绍了纳米材料在改性水性聚氨酯中的研究进展,并对纳米材料在水性聚氨酯中的应用前景提出展望。     

磷酸化改性纤维素纳米纤丝复合聚氨酯制备pH响应性形状记忆材料

本研究通过在纤维素大分子中引入磷酸基团获得具有pH敏感性的磷酸化纤维素纳米纤丝(Phosphorylation Cellulose Nanofibril,PCNF),然后采用溶剂共混复合聚氨酯(PU)成功制备了具有pH响应能力的形状记忆材料.探究了不同PCNF接枝已内酯材料(PCNF-CL)添加量下PCNF/PU复合材...     

环保型水性聚氨酯真皮涂饰剂应用研究

以聚有机硅氧烷为改性剂,采用预聚、扩链改性及中和乳化技术制备了高性能环保型水性聚氨酯真皮涂饰剂。研究了改性聚氨酯涂层的表面化学组成、表面疏水性以及表面干／湿擦牢度等性能。实验结果表明,所制备的乳液能稳定存在1年以上,由于聚有机硅氧烷的引人以及成膜过程中原位交联的实现,制得的聚氨酯涂层具有疏水性好、干／湿擦牢度高的特点。     

湿法制备碳纤维增强树脂基复合材料

文章研究了以196不饱和聚酯树脂为基体,以聚丙烯腈基碳纤维为增强材料制成的复合材料的制法及其性能的测试。     

不同废纸纤维增强聚乳酸基复合材料性能研究

通过纤维分析仪、傅里叶变换红外光谱仪（FT-IR）、扫描电镜（SEM）研究4种废纸（废新闻纸、废箱纸板、办公废纸、废书刊纸）纤维的表面形貌和结构特性;然后以聚乳酸（PLA）为基体、4种废纸纤维为增强体,利用注塑成形法制备废纸纤维/PLA生物可降解复合材料并探究废纸纤维对复合材料界面相容性和力学性能的影响。结果表明,废新闻纸纤维表面受损严重,多处出现扭结及横节纹;废箱纸板及废书刊纸纤维形态完整,扭结程度低且表面较为粗糙;办公废纸纤维长径比较大、细小纤维含量较少、纤维形态特性良好但表面相对光滑。废新闻纸/PLA复合材料和办公废纸/PLA复合材料的界面相容性较差,废纸纤维对PLA基体力学性能的增强效果一般;废箱纸板/PLA复合材料和废书刊纸/PLA复合材料的界面相容性较好,且废纸纤维有一定承力作用,对PLA基体弯曲性能和拉伸性能的改善效果较好。