Study On The Preparation And Propetries Of Poly(lactic Acid)/Poly(butylene Succinate)/Jute Fiber Composites

In recent years, environmental pollution and shortage of non-renewable resource havebecome significant problems. Therefore, biodegradable polymers—Poly(lactic acid) hasbecome a research emphasis. However, the applications of PLA were heavily limited tocertain fields, due to the obvious drawbacks like poor heat resistance and low impactstrength. In this study, Jute fiber was used to reinforce PLA. On the premise of remainingbiodegradability of PLA, not only can Jute fiber improve mechanical properties ofcomposites, but can be nucleating agent to improve heat resistance. Then maleatedpoly(lactic acid) and-aminopropyl triethoxy silane were used as interfacial modifier inPLA/Jute fiber composites. PBS was used to toughen PLA and dicumyl peroxide was usedas cross-linking agent to improve compatibility of PBS and PLA.PLA/Jute fiber composites and PLA/PBS/Jute fiber composites were prepared by meltblending. Mechanical characterization, scan electron microscope and DSC were applied toresearch the properties of composites. The following experiment results were received.1. As the jute fiber mass fraction increased, the tensile strength and impact strength ofPLA/jute fiber composites increased, the elongation at break decreased. In addition, as thelength of fiber increased, the tensile strength and impact strength of composites increasedand then decreased, the elongation at break decreased. From DSC results, when jute contentwas high, there were two melting endothermic peak, due to a more regular crystal structure.In addition, with the length of jute fiber increased, the crystallinity of poly(lactic acid) wouldrise.2. Silane solution was used to treat with the surface of jute fiber. As the concertration ofsilane solution increased, the tensile strength, impact strength and elongation at break ofPLA/jute fiber treated by silane composites increase, and then decreases. When theconcertration of silane solution was1wt%, the mechanical properties of composites achievedoptimal state and PLA/jute fiber composites had a good interfacial compatibility. From DSCresults, as the concertration of silane solution increased, glass transition temperature, coldcrystallization temperature and melting temperature at first increased and then decreased.When the concertration of silane solution was too high, there were two melting endothermic peak, because oligomers produced by self-polymerization reaction of silane groups could benucleating agent.3. MAPLA as interfacial modifier was prepared. As the content of MAPLA increased,the tensile strength, impact strength and elongation at break of composites increased, andthen decreased, and elongation at break of composites decreased. When the content ofMAPLA was3wt%, the mechanical properties of composites achieved optimal state andPLA/jute fiber composites have a good interfacial compatibility. From DSC results, with thecontent of MAPLA increasing, the glass transition temperature and cold crystallizationtemperature increased. There were two melting endothermic because of MAPLA, whichindicated that MAPLA could be nucleating agent. In addition, the crystallinity of poly(lacticacid) also increased with the content of MAPLA increased.4. With the content of PBS increasing, the impact strength of composite materials willincreased and then decreased, and elongation at break increased, while the tensile strengthreduced. From DSC results, there were two melting endothermic due to PBS.5. DCP was used as cross-linking agent. From the mechanical results, DCP couldimprove mechanical properties of composites, because DCP could allow PBS to blend wellwith PLA. From DSC results, With DCP, the glass transition temperature, coldcrystallization temperature and melting temperature increased, the crystallinity decreased.