| The pollution of plastic waste threats human survival environment and the research of "Green Polymers" has received wide attention. Starch is a natural polymer, its wide variety of sources, low cost, and can completely degrade in the natural environment. Starch-based degradable plastics have partially replaced the traditional oil-based plastics and have been studied extensively.In this paper, a serial of photo/biodegradable LDPE films were prepared by adding ferric stearate (FeSt3), butyl acrylate grafted starch into the LDPE matrix. and film aging artificial UV light and soil Buried biodegradation. Based on the artificial acceleration ultraviolet photo-degradation, biodegradation of soil burial test, the mechanical propertie, FT-IR spectrum, viscosity average molecular weigh and DSC propertie were measured and the degradation mechanism is preliminarily discussed. The results showed that photo sensitizer FeSt3 has a dual role in the LDPE film and the suitable dosage is 0.2%; when starch and photo-sensitizer contents ware fixed, the carbonyl index of LDPE film first induce, then increase, degradability and crystallinity also increase, with the exposure time prolonged. Weight loss of film first increased and then remained unchanged as the soil burial time extended.In this paper, with starch deal with glycerol, coupling agent (silane coupling agent KH560 and coupling agent NDZ-102) and grafted by butyl acrylate (BA-g-Starch),a class of starch/polylactic acid biodegradable materials hve been prepared, the Mechanical properties also been tested. The results show that it works best when BA-g-Starch is added to PLA matrix and decrease water absorption. SEM analysis showed that the starch particle size and void density was significantly reduced, compatibility has been greatly improved although the starch/PLA blends shows brittle fracture as the BA-g-Starch has been added. EVA-g-MAH could be improved elongation and toughness,its suitable amount is 10%. TGA analysis showed the initial thermal decomposition temperature increased observably by adding EOMMT to the starch/PLA(10/90)system, it increases from 250℃to 275℃with the EOMMT contents changing from 0 to 7 Phr. Soil burial test showed that when component TPS / PLA blends was 20/80,The component mainly eroded by bacteria is starch in the early, then is PLA in the mid-late time. starch; biodegradation... |
