Study On In-situ Microfibrillar Reinforced Composites Based On The Recycled PET

With the extensive attention of green environment, the sustainable developmenteconomy and the resource recovery have deserved more attention from the society. And theproduction of the waste polyester bottles is huge. It has an excellent value in use, whoserecovery rates has reached95%. And the recycle of the waste polyester bottles developrapidly. It is widely used for spinning and blow molding. In-situ microfibrillar compositefilmes based on PP/rPET were prepared in order to expand the application area of the wastepolyester bottles. The processing included melt-extrusion, hot-stretching and quenching. Andthe high-performance wood-plastic was prepared by adding the rPET in-situ micro-fibrillarmaster batch.The mechanical properties influenced by the different processing, the content of rPET,the different additive had been studied in this paper. And the relationship between themechanical properties and the internal structure also had been studied through the differenttest instruments, such as DSC, SEM and MFR.The results showed that the mechanical properties of PP/rPET in-situ microfibrillarcomposite filmes was the best when the processing temperature was260℃. And themechanical properties increased by100%when the content of the rPET was15%. Themechanical properties could be better if added compatilizer, nucleating agent and elastomer tothe composites. The SEM and the DSC showed that the rPET microfibrils have good directionand it could play a role in promoting the crystallization of PP and induceing the crystallizationalong the rPET microfibrils, which could improve the mechanical properties of compositefilmes.The rPET/PP In-Situ microfibrillar to modify wood plastic composites were also studiedin this paper. The rPET/PP In-Situ microfibrillar master batch was made firstly, then addedthe master batch in wood-plastic composite. The mechanical properties influenced by thedifferent processing, the content of rPET, the different additive had been studied in this paper.The crystallization and the microstructure of PP were also studied through the different testinstruments, such as DSC, SEM and MFR.The results showed that the wood-plastic composites which were processed in differentways had different mechanical properties. And the rPET/PP In-Situ microfibrillar to modifywood plastic composites had the best mechanical properties. The non-notched impact strengthcould increase by200%when the content of the master batch was40%. The SEM and the DSC showed that the rPET could keep microfibrillar when was added to the wood-plasticcomposites. The rPET microfibrils have good direction and it could play a role in promotingthe crystallization of PP, which could improve the mechanical properties of composite. AndThe MFR test showed that the processability wasn’t influenced when the content of themaster batch below40%. At the same time the heat-resisting performance was improved.