Preparation And Performance Study Of Composites Based On Poly (Cyclic Butylene Terephthalate)

Cyclic butylene terephthalate has the properties of low viscosity, fast polymerization, thermalforming, and none of heat of reaction, volatile organic compoundsomposite, emissions. Itboth possesses the processing character of thermoset and can be moulded with moremethods. Meanwhile after the cyclic butylene terephthalate polymerized, it can be repeatingprocessed like polybutylene terephthalate. In view of these features, the application field of cyclicbutylene terephthalate gets continuously expanded. The market prospect is promising.But in comparison,the mechanical property of poly (cyclic butylene terephthalate) is lower than polybutylene terephthalate.Therefore this paper would research the improvement of the mechanical property by preparing thecomposites based on cyclic butylene terephthalate. So that we could develop the thermoplasticity plasticwith better mechanical properities, processing performance, recycling and superior performance.Glass fiber (GF) reinforced poly (cyclic butylene terephthalate)(PCBT) composites were preparedvia thermoforming. The effects of polymerization temperature, content of catalyst and the ratio ofcyclic butylene terephthalate and glass fiber on the properties were researched. The results indicatedthat with the increase of the polymerization temperature, the molecure, crystallinity and mechanicalproperty of composites constantly enhance. The composites achieve the highest mechanical propertywhen the polymerization temperature is210℃. The mechanical properties of composite change littlewith future heating up. The molecure, crystallinity and mechanical property of composites constantlyenhance with the increase of the content of catalyst. The mechanical properties of composite changesunconspicuous after adding0.4%wt catalyst.The result is that the composites get the highermechanical property when the ratio of CBT and GF was1:1.Epoxy resin reinforced poly (cyclic butylene terephthalate) composites were synthesized bycontrolling the catalyst content, polymerization temperature and the content of epoxy resin. The resultsindicated that with the increase of the content of epoxy resin, the mechanical property of compositesconstantly enhance and finally stable. It is better to get the composites when the content of epoxy resinis2%wt. The results indicated that the molecure,glass transition temperaturerystallinity and elongation atbreak constantly enhance but the crystallinity, tensile strength and modulus constantly lower. It is bestto get the composites at210℃with highest mechanical property. When the mass fraction of catalyst is0.5%wt, the toughness of composites achieve the best.In this paper, polycaprolactone reinforced poly (cyclic butylene terephthalate) composites hasbeen synthesized. We controlled the catalyst content, polymerization temperature and the content ofpolycaprolactone. The research showed that the copolymer of two kinds of material has been synthesized. We find that the crystallinity of composites was lower, the elongation at break washigher and the toughness has been improved when the content of polycaprolactone gets7.5%wt. Themechanical properties of composite change little with future polycaprolactone. The results indicatedthat the molecure,glass transition temperaturerystallinity and elongation at break constantly enhance butthe crystallinity, tensile strength and modulus constantly lower. It is better to get the composites at210℃with highest mechanical property. The effect of the property of composites with the massfraction of catalyst was studied.The results indicated that the molecure and toughness of compositesachieve the best when he mass fraction of catalyst is0.5%wt.The poly (cyclic butylene terephthalate)/carbon nanotube composite materials weresynthesized through vacuum molding. The properties of composite have been studied with thecarbon nanotube content, catalyst content and polymerization temperature. The results indicated thatwith the increase of the content of carbon nanotube the mechanical property of composites constantlyenhance and achieve the best when the content of carbon nanotube is0.05%wt. The mechanicalproperties of composite change little with futurecarbon nanotube. The results indicated thatmaterial get superior performance when the mass fraction of catalyst is0.5%wt. The propertiesshowed the higher value when the polymerization temperature reaches210℃and showed little changewith the further increasing of the polymerization temperature.