Abstract
A fully degradable PLA/starch composite was prepared by one-step in-situ compatibilization method. The effects of raw materials ratio and maleic anhydride （MAH） dosage were studied by thermogravimetric analyzer (TG) and scanning electron microscopy (SEM). The thermal stability and microstructure of the composites were investigated, and the non-isothermal thermal decomposition kinetics of the composites were discussed. The DTG results show that there are two distinct maximum decomposition rate peaks in the unmodified composites. After the MAH is added, the maximum decomposition rate peaks of the composites are close to each other. In addition, as the MAH dosage increases, the maximum rate of decomposition peak gradually shifts to a lower temperature. The SEM results show that the compatibility of the composites is improved after the addition of MAH. And both the Kissinger and Flynn-Wall-Ozawa methods are well described for the non-isothermal thermal decomposition kinetics of PLA and PLA/starch composites.
Highlights
Synthetic polymers have brought great convenience to industrial, agricultural production and human daily life, yet have caused serious environmental pollution problems
3.1.1 thermogravimetric analyzer (TG) Analysis of Composite Materials with Different Blending Ratios Figure 1 shows the TG and DTG curves for different ratios of Polylactic acid (PLA)/starch composites. It can be seen from the figure that when the starch content is higher, the initial thermal decomposition temperature(Ti) of the composite material is lower, indicating that the thermal stability of the composite material decreased by increasing the starch content
A fully degradable PLA/starch composite was prepared by one-step in-situ compatibilization method
Summary
Synthetic polymers have brought great convenience to industrial, agricultural production and human daily life, yet have caused serious environmental pollution problems. Biodegradable polymer materials have received much attention in recent years[1,2]. With the rapid development of commercialization of biodegradable plastic products, biodegradable materials have been widely used in packaging [3,4], agriculture [56], medical [7,8], 3D printing [9,10,11] and other fields. PLA has disadvantages such as high production cost, low crystallization rate, and high brittleness, limiting its wide application. Starch is a completely biodegradable natural polymer material, which is favored by most researchers because of its abundant source and low price. A large number of studies have used starch to modify PLA [12,13,14] to reduce the cost of PLA and improve the biodegradability of the material
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