Properation And Properties Of Poly(Butylene Succinate-co-butylene Adipate)/Thermoplastic Starch/Poly Lactic Acid Composites

With the energy crisis caused by the shortage of oil and―WHITE POLLUTION‖caused by the waste plastics intensify, governments and scientists pay more and moreattention to the research on biodegradable materials. This thesis dedicates to the analysis ofternary complex composites that is prepared by blending Thermoplastic Starch (TPS) andPolylactic Acid (PLA) with Poly(butylene succinate-co-butylene adipate)(PBSA) which issuccessfully commercialized by Kingfa Sci&Tech Co Ltd. This thesis also studies therelationship between their structure and properties by FT-IR, DSC, SEM and mechanicalproperty analysis. Ultimately, it finds a way to industrialization of this composites andcreating economical profit based on the ternary complex formula.Firstly, by the use of TPS and PBSA, a series PBSA/TPS composites is prepared bymelting method, the influence of the dosage of TPS on the structure, mechanical property andthermal properties of PBSA/TPS compositesare are studied. Research shows that thermalproperties and tensile properties of the composites decrease with the increase of the dosage ofTPS, and the decrease speeds up rapidly when the dosage of TPS is more than30%. From theperspective of cost, the cost of composites is lower when TPS dosage is30%. However, theissues of dispersion and heat resistance of TPS in the composite need to be addressed.Secondly, the TPS/PLA composites is prepared by melting method. The structure,mechanical property and thermal properties of TPS/PLA composites are studied by the test ofFT-IR, TG, SEM and mechanical properties analysis. The result of mechanical propertiesresearch shows that with the dosage of PLA reduction, the elongation at break of TPS/PLAcomposites first increase and then decrease.There is interaction between TPS and PLA. Theresult of TG shows that PLA can significantly improve the thermal decompositiontemperature of the TPS/PLA composites.The analysis of SEM shows that TPS has gooddispersion in TPS/PLA when the amount of PLA is80%, but it’s compatibility becomespoorer when the amount of PLA is reduced. To sum up, there is interaction between the PLAand TPS, and PLA can improve the heat resistance of TPS/PLA composites.Thirdly, based on30%of TPS dosage, the ratio of PBSA and PLA is adjusted, and aseries of PBSA/TPS/PLA composites is prepared by melting method. The structure, heat resistance, mechanical properties of PBSA/TPS/PLA composites are studied by FT-IR, TG,SEM and mechanical testing analysis. The test result of mechanical properties shows whenthe PBSA/TPS/PLA composite ratio is respectively60/30/10and55/30/15, the mechanicalproperties are improved significantly; The TG result shows that the thermal decompositiontemperature of the composite material drastically decrease when PLA is more than15%.Ultimately the ratio of PBSA/TPS/PLA composites formula is determined at60/30/10.Finally, avent is added in the TE-65type syntropy parallel double-screw extruder. Massproduction is carried out by improved technological process and procedures according to theproportion of the base formula obtained through experiments. The CPK which is calculatedfrom the melt index of PBSA/TPS/PLA composites is1.48. It proves the scientificity andrationality of the technological process. By the certification of biodegradable materials andthe exploration of the application of the mass production product, we have proved theexcellent biodegradability of PBSA/TPS/PLA composites, and achieved the target ofestablishing a productionline with an annual output of2000tons.