Sureface Modification Of Bamboo Fiber And Its Composites

In this paper, FT-IR and XPS were used to study the reaction mechanism between urushiol- ferric and bamboo power (contain bamboo fibre and lignin). The results showed that aldol condensation reaction occurred between carbonyl and hydroxyl in lignin molecules; the hydrolysis of iron(â…¢) leads to the formation of iron hydroxide gel, then the iron hydroxide gel adsorbed onto the surface of bamboo fiber by hydrogen-bonding. Comparing the advantages and disadvantages of the two different reaction mechanisms, we decided to use the bamboo fibre as the raw material in the follow-up study.In the follow-up study, bamboo fibers were coated by two kinds of natural urushiol-metal compounds (urushiol-ferric and urushiol-titanium) via in-situ polymerization. BCFeU and BCTiU were obtained. A direct correlation was found between coating ratio of BCFeU/BCTiU and activation time, concentration of urushiol, reaction time and concentration of ferric chloride. Five methods consisting of polarizing microscope, SEM, XPS, TG and DSC were used to characterize the BCFeU/BCTiU. Then BCFeU/PP and BCTiU/PP composites were prepared. The microstructure and physical mechanical properties of composites were studied.The results show that BCFeU was obtained successfully and urushiol-ferric coated on the bamboo fibres through hydrogen bonding. Tensile test results and SEM analysis of tensile fracture surfaces showed that urushiol-ferric acted as a coupling agent in BCFeU/PP composite. The coating rate of BCTiU was 35% under the optimum preparation condition. Urushiol-titanium could effectively delay the thermal decomposition of bamboo fibers and improve the interface bonding between bamboo fibers and PP matrix.To compare study, the lauryl methacrylate was initiated by benzperoxide and grafted onto bamboo fibres. The presence of lauryl methacrylate on the grafted product was indicated by FT-IR spectroscopy, XRD, TGA and DSC. Simultaneously, B BP/B-g-LM/PP composites were prepared and mechanical properties were tested. The interfacial compatibility of BP/B-g-LM/PP composite was characterized by SEM analysis. The results showed that LM was grafted onto bamboo fibres successfully. B-g-LM served like plasticizers between BP and PP matrix. Under the best conditions of BP/B-g-LM/PP-15 composite, a 400% increase in elongation at break was got by test, and impact strength and maximum deflection increased by 75% and 600% respectively.