Study On Preparation And Properties Of Polybutene Foaming Materials

Polybutene (PB) having excellent flexibility, impact resistance, stress crack resistance, creep resistance, heat resistance to stress, is called "plastic gold ". As a precious resource, PB is just used in the field of the pipe, sealing materials and film, and there is rarely report about the studies on PB foaming material. So it is necessary to carry out the study on PBFM (Polybutene foaming material) to broaden its application.The main work of this paper is as follow.1?By using molding foaming principles, PBFM was prepared with AC as the foaming agent. The influence of process conditions, the amount of AC foaming agent and DCP crosslinking agent on bubble structure and properties was investigated. The effects of the content, particle size of nucleating agents on the mechanical properties and cellular structure of foams were studied. The results showed that, when calcium carbonate in particle size of 1500 mesh added in an amount of 6% as a nucleating agent, cell density raised up to 106 cm-3, and average cell diameter size was 85?m, elongation at break was of 249%.2?By using vacuum foaming principles, PBFM was prepared with Supercritical CO2 as the physical foaming agent. By using PS microspheres modified with KH550 to build up the dual-cell structure in PB/PS microsphere foaming material. And the impact of PS microsphere surface properties on the cell structure was explored. The results showed that when adding 1.5wt% modified PS microspheres, the foaming material obtained was of 0.068g·cm-3 in density,18.28?m in cell diameter and 4.578 1010·cm-3 in cell density.3?PB/CB conductive foam composites was prepared with CB as conductive filler, and the effect of the added amount of CB on the cell structure and the piezoresistive behavior of conductive composites was studied. The results showed that when the load of CB was 6 wt%, the composites obtained was of 0.19 g·em-3 in density,57.98?m in cell diameter and 2.99×107 cell·cm-3 in cell density. The composites had an excellent repeatability in performance. And there was a negative pressure coefficient effect in electrical resistance during compression cycles. It was a kind of sensitivity piezoresistive conductive composites.