Studies On Strengtnening Bulk Of Composite Of Polyolefins/mica

Mica(K₂O·3Al₂O₃·6SiO₂·2H₂O)is a naturally occurring mineral. The material isendowed with the peculiar features of adiabaticity and an electrical insulator, it alsoposses high-dielectric properties. As such, it constitutes an important and usefulmaterial in the electronics industry. Mica is frequently used as a filler in polymericmaterials in recent years, It is often necessary to treat mica with coupling agents, suchas silane coupling agent, bulking agent and titanate etc, in order to improve itsdispersing condition in a matrix, prevent aggregation and reinforce the interfacialcoherence with resin. The main contents have been summarized as following:(1) The hydroxyl groups on the surface of mica particles can interact withanhydride groups [–(C=O)2–O–] of copolymerizationmacromolecular coupling agents(PP-g-MAH) and an organic coating layer was formed. PP-g-MAH was designed andsynthesized in dimethylbenzene system using benzoyl peroxide (BPO) as initiator. Onthe basic of three single factor optimizing experiments and orthogonal test, theappropriate composition of PP-g-MAH was obtained.(2) Mica was subjected to a surface treatment with five types of coupling agents:KH550, KH550/PP-g-MAH, PP-g-MAH, titante coupling agents and aluminatecoupling agent. This study applied gas chromatography (GC) to examine the surfaceproperties of an untreated mica and mica treated with several different types ofcoupling agents. This paper presents and discusses the dispersive properties expressedby rsd, which is the dispersive component of the surface free energy, as determined atvarious temperatures. The rsd values of the mica treated with aluminate coupling agentwere the highest, while those of the mica treated with KH550 and PP-g-MAHtogether were the lowest at the same measuring temperature. as well as the dispersiveand specific components of the free energy of adsorption of the solid were calculatedfrom the GC data at zero coverage. The result indicate that modification effect ofKH550/PP-g-MAH/mica was the best and GC was good evaluated way. (3) Gas chromatography technology was applied to characterize the surfaceproperties of HDPE and nano-PVC. The retention time of different probes on HDPEand nano-PVC were determined by the Gas Chromatography (GC) technology atexperiment temperature and free energy and Lewis number of HDPE and nano-PVCand was figured out. The results showed that the surface free energy of HDPE andnano-PVC all decreased linearly with the temperature increased, HDPE andnano-PVC were both weak basic Lewis amphoteric polymer material. This workcould be used as reference to the research of surface properties modification ofhigh-density polyethylene and inorganic mineral blend.(4) Infrared chemical imaging was applied to characterize the dispersity of usingKH550/PP-g-MAH modified mica in nano-PVC. It was found that the dispersity of30% modified mica in nano-PVC was best.