Preparation And Characterization Of Polymeric Adhesive And Polycaprolactone/Hydroxyapatite Nano-composite Material

In recent years, the development of new synthetic polymeric materials has been gradually extended to the medical, telecommunications, photoelectricity, agriculture and other fields. In the paper, the synthesis and application of polymeric adhesive and biodegradable polycaprolactone(PCL)/hydroxyapatite(HA) nano-composite material were discussed. This paper is divided into two parts: In the first part, the synthesis of acrylic adhesive and two-component polyurethane adhesive were studied; and in the second part, the preparation of PCL/HA composite material were investigated. The main contents are as follows:(1) The acrylic adhesive was synthesized by the method of semicontinuous emulsion polymerization. The effect of the weight ratio of monomer, type and quantity of functional monomer, the amount of emulsifier, reaction time and temperature on the properties of adhesive was discussed. And the molecular structure of the acrylate adhesive was characterized by FT-IR. Finally, the better production process of acrylic adhesive was determined. The results showed that the acrylic adhesive with small size and excellent stability was successfully synthesized, which could be applied in the field of printing and dyeing.(2) The two-component polyurethane adhesive, which can be used in the adhesion of plastic-plastic, was prepared in this part. The main agent was synthesized by castor oil and toluene diisocyanate(TDI), and the curing agent was polymerized by Trimethylolpropane(TMP) and TDI. When the main agent and curing agent were compounded, a small amount of catalyst was added. The effect of molar ratio of NCO to OH, the weight of activator and the weight ratio of main agent and curing agent on property of adhesive was investigated. And the curing process of the adhesive was characterized by FT-IR. The results showed that the properties of the adhesive were excellent. And the adhesive may be applied in industry for its low-cost and simple-technique in near future.(3) The nano-particles of HA was obtained by calcining the natural pig bone. Then, the PCL/HA composite material was synthesized by CL and produced HA via in-situ polymerization. We discussed the effect of different weight ratios of HA to CL on the performance of composite material, and the morphology and microstructure of obtained composite material were characterized by SEM, FT-IR and XRD, et al. The results showed that HA was uniformly dispersed in PCL matrix. And there was a better interface compatibility between them. The composite materials with good strength and biocompatibility possess the superior capability of both HA and PCL. The study provided a new way for synthesizing composite materials that could be used for repairing and substituting for human damaged bone, which is significant in theory and practice of bio-medicine.