Preparation And Research Of Functional Modification Of Poly(Butylene Succinate) Composites

Nowadays, vehicle is not only a tool of transportation, but also a comfortable moving space. Light-weight, high-tech and recycling of green cars are strongly promoted in automotive industry. Poly (butylene succinate) (PBS), as a fully biodegradable thermoplastic, have developed rapidly due to its integrated performance and processibility. However, the relatively poor mechanical properties and flammability of PBS limit the application in the field of automotive materials. Therefore, basalt fiber (BF) as a reinforcing component and aluminum hypophosphite (AHP) as a flame-retardant component were separately incorporated into PBS matrix. A series of PBS-based composites were fabricated via melting blending using internal mixer followed by injection molding. The effect of BF and AHP on tensile property, crystallization behavior, crystal structure, flame retardancy and thermal stability were specially discussed. The main contents were summarized as follows:Four different ratios of modified basalt fiber/polybutylene succinate (MBF/PBS) and BF/PBS composites were prepared for comparison. The effects of content and surface morphology of basalt fiber on properties of MBF/PBS were investigated. After modified with silane coupling agent (KH550), the efficient interfacial bonding force between MBF and PBS matrix was greatly enhanced by the surface roughness of basalt fibers, resulting a significantly improvement of tensile property compared with that of neat PBS and raw BF/PBS composites. It is interesting that the phenomenon of transcrystallization on the rough surface of MBF can be observed. The result indicated that the rough fiber played heterogeneous nucleation effects on the crystallization of PBS, further accelerated the crystallization rate of MBF/PBS composites. These results provide supporting data for the production period of PBS.A series of flame-retardant PBS/AHP composites were fabricated, and the effect of AHP content on tensile property, crystal morphology, flame retardancy and thermal stability were investigated. The results showed that small amount of AHP improved the tensile strength of PBS/AHP composites, however, the tensile strength decreased as further increase amount of AHP. The analysis of crystallization showed that the incorporation of AHP increased the nucleation density of PBS crystal, reduced the crystal size and further enhanced the crystallization rate of PBS. With the increase amount of AHP, the PBS/AHP composites had higher LOI value and can reach the V-0 rating easily. Studies on char-forming behavior of PBS/AHP composite demonstrated that AHP contributed to the formation of char during combustion. Based on the above results, the PBS/AHP composites has a great potential in the field of automotive interior materials.