Preparation And Characterization Of Bio-based PBS And Cellulose Composites

Recently the biodegradable materials have led to a widely concerning, which could solve the environmental consciousness and relieve the energy crisis in the community. Currently, part of biodegradable materials has been achieved industrialization, however, its price is expensive and the performance is not meeting the application requirements. Therefore, bamboo fibers (BF), cellulose diacetate (CDA) and other natural polymer materials composite with biodegradable polymer which development of renewable resources based entirely on bio-based composites, could not only reduce costs, mechanical and other properties could also improve, expanding the scope of application. Among them, Poly(butylene succinate) (PBS) as a semi-crystalline biodegradable polyester has good mechanical properties, the problems of compositing with fibers is to enhance the role of the interface between each other.The poly(poly(ethylene glycol) methyl ether methacrylate) (PPEGMA), which was compobility with PBS, grafted onto bamboo fiber (BF) (BF@PPEGMA) was synthesized via the esterification and atom-transfer radical polymerization (ATRP) methods, then the poly(butylenes succinate) (PBS) matrix based composites including BF and BF@PPEGMA were prepared by a twin-screw extruder, injection moulding, the treated BF was Characteriasd by FTIR, XPS, SEM and TGA, the PPEGMA are believed to be successfully grafted onto the surface of BF, for the segment of PPEMGA being worse stable, the thermal stable of grafted BF is decreasing. Also we have been measurement about composite by SEM, tensile properties, water absorption, TGA, crystallization, POM. The SEM indicated that the the incorporation of PPEGMA onto BF improved interaction between BF and PBS matrix, which will eventually affect the mechanical properties of PBS composites; the composite including treated BF have higher tensile strength, elastic modulas, and elagation at break, the content 15% PPEGMA@BF was increasing to 318.6MPa; It is further noticed that PBS/BF@PPEGMA composites showed more weight loss stages than PBS/BF composites at the same BF content, due to the existence of thermally less stable PPEGMA segments. It is indicated that the existence of BF served as nucleating agent, the values of melting and crystallization enthalpy of composites are lower than those of pristine PBS. The existence of PPEGMA improved interaction between BF and PBS, making PBS segments more flexible and easy to crystallize at higher temperatures. The water absorption of PBS/BF@PPEGMA composites was lower than that of PBS/BF composites due to the change of interface properties. It is believed that a large amount of hydroxyl groups on BF were reacted and substituted by PPEGMA.Poly(butylene succinate)/cellulose diacetate (PBS/CDA) blends were fabricated via the solution casting method. The structure, morphology, crystallization and mechanical properties of the blends was characterized by fourier transform infrared spectra (FTIR), wide-angle X-ray diffractometer (WAXD), scanning electron miscroscope (SEM), polarized optical microscopy (POM), differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), and electronic universal test machine. The results indicated that the carbonyl groups of PBS shifted to lower wavenumbers due to the formation of hydrogen bonding between PBS and CDA. The X-ray and DSC analysis suggest that the crystallization of PBS was significantly restricted by the incorporation of CDA, which is attributed to the hydrogen bond. The SEM and POM results revealed that PBS and CDA were compatible without appearance of obvious phase separation. The hydrogen bonding interaction led to the change of decomposing mechanism of blends as determined by TGA. The elongation at break was improved by the addition of CDA due to the reduced crystallinity of PBS. The existence of CDA led to the decrease of water contact of angle, showing of the improved hydrophilicity.