Structure And Properites Of The Hybird Composite Of Polyphenylene Sulfide (PPS)

With the development of science and technology, general plastic has been unable to meetthe social needs in some areas. So the engineering plastics have been used widely in recentyears, and the polyphenylene sulfide (PPS) as an engineering plastic has been attracted highattention. PPS has many excellent properties, including good thermal stability and flameresistance, resistance to chemical attack, electrical insulating property, mechanical anddimensional stability. So it has already been used widely in electronic and electrical industries,machinery manufacturing, automobile manufacturing, chemical instruments and aerospaceindustries. But PPS also have some defects, such as poor toughness, low glass transitiontemperature, easily generate creep long used at90℃, high cost. These disadvantage limit theapplication of PPS.In this article, a kind of novel hybrid composite with excellent comprehensiveperformance was prepared by addition of toughening agents liking TLCP, Surlyn8920, PVDF,and E-MA-GMA and reinforcing agents liking glass fiber and halloysite nanotubes (HNTs)into PPS.To begin with, TLCP, Surlyn8920, PVDF and E-MA-GMA were used to toughen PPSrespectively. It was found that TLCP, Surlyn8920and PVDF had a certain toughening effectand the notched impact strength can increase about25%~35%compared with pure PPS. Butthe toughening effect of E-MA-GMA was the optimum, and izod notched impact strength ofPPS/E-MA-GMA composite was450J/m, increased by12times, compared with pure PPSwhen the content of E-MA-GMA was up to12wt%. Addition of E-MA-GMA also hadinfluence on tensile strength, flexural strength, heat distortion temperature, melts index, thestorage modulus, loss modulus, glass transition temperature and limit oxygen index. DSCshowed that E-MA-GMA had a certain effect on the crystalline properties of the composite.SEM indicated that no obvious interface separation between PPS and E-MA-GMA, whichmeans PPS and E-MA-GMA were well compatible with each other.Moreover, with increasing of glass fiber content, the mechanical properties ofPPS/E-MA-GMA/GF composite were improved obviously, although the wear resistance,melt index and limiting oxygen index were decreased slightly. Glass fiber treated with KH550had a clear effect on performances of the PPS/E-MA-GMA/GF composite. Thetensile strength of PPS/E-MA-GMA/GF composite was more than120MPa, flexural strengthreached180MPa, flexural modulus was above9GPa, but the izod notched impact strengthhad a larger decline when the content of glass fiber was30wt%. DSC showed that GF had acertain influence on the crystalline properties of the composite. SEM showed that KH550cansignificantly improve the interfacial interaction of the glass fiber and the matrix resin.Finally, halloysite nanotubes treated by KH550had a large effect on the comprehensiveperformance of the PPS/E-MA-GMA/GF/HNTs hybrid composite. The comprehensiveperformance of the composite was the best when the loading of halloysite nanotubes was6wt%. The tensile strength of PPS/E-MA-GMA/GF/HNTs composite increased by around12%in comparison with the PPS/E-MA-GMA/GF composite, flexural strength increased by14%, flexural modulus increased by24%, izod notched impact strength decreased by about25%and storage modulus, melt index, limiting oxygen index and HDT had different levels ofchange when the content of HNTs was6wt%. DSC showed that HNTs had a certain influenceon the crystalline properties of the composite. SEM showed that halloysite nanotubes weretubular structure and uniformly distributed in the PPS/E-MA-GMA/GF/HNTs hybridcomposite and the diameter of glass fiber was much bigger than halloysite nanotubes. Theglass fibers were the main reinforcement materials and halloysite nanotubes were auxiliarymaterials.