Abstract
Polylactic acid (PLA) / polyolefin elastomer (POE) / modified starch composites were prepared by melt blending. The composites were characterized by softening point, polarizing microscope, melt flow rate, tensile strength and degradation properties. The results showed that with the increase of modified starch and POE content, phase separation occurred between modified starch and PLA, and the tensile strength decreased compared with pure PLA. Modified starch could increase the crystallinity of PLA to increase the softening point and improve the thermal stability of PLA. When the modified starch and POE content were 15 and 20 parts respectively; the composite material has the best performance. At this time, the softening point was 75°C and the tensile strength could reach 47.7 MPa. The composite materials in different media showed the quality decreased with the prolongation of degradation time, especially in acidic and alkaline conditions, because the degradation rate of hydrolysis was accelerated.
Highlights
With the progress and development of society, the environmental pollution problems caused by the wide application of plastics are becoming more and more serious
It can be formed by blow molding, molding and extrusion processing, but its poor impact resistance, heat resistance and hydrophilicity limit its wide application. [1,2,3]At present, the main method to improve the disadvantages of Polylactic acid (PLA) is to toughen PLA, including copolymerization, blending and processing modification
At 140 °C crystallization conditions, the composite material has crystallized completely, because the interaction force with the matrix PLA restricts the movement of the molecular chain, and forms a rigid interface between them
Summary
With the progress and development of society, the environmental pollution problems caused by the wide application of plastics are becoming more and more serious. Polylactic acid (PLA), as a kind of material made from starch and biodegradable, has attracted people's attention. The polyester bond in the polylactic acid molecule has the advantages of high modulus and high strength. It can be formed by blow molding, molding and extrusion processing, but its poor impact resistance, heat resistance and hydrophilicity limit its wide application. Blending modification is simple, feasible and low cost, and the blend system can balance the performance of each component, achieving the effect of complementing each other and obtaining a modified material with good comprehensive performance. Starch has the advantages of a wide range of sources, low cost and short degradation cycle.
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