Preparation And Properties Of PLA/POE Blends

Polyethylene is one of the extensively used polymer materials and has been industrialized for decades. To satisfy the need of processing and applications, the study on the degradation and stability of polyethylene is an active field. Metallocene linear low density polyethylene (m-LLDPE) is polymerized by metallocene catalyst in the1990’s. Metallocene catalyst with the single-site catalyst nature with narrow comonomer distribution and homogeneous comonomer distribution Based on homogeneous distribution, the metallocene polyethylenes have physical and mechanical properties compared to those produced using conventional catalysts with the same average molecular weight. In this work, m-LLDPE and two kinds of traditional LLDPE copolymerized with diferent comonomers were selected to study the photo-oxidation and thermomechanical degradation stability of m-LLDPE. The efect of photo-sensitizers on the thermomechanical degradation of m-LLDPE was also studied, as well as the efect of thermomechanical degradation and photo-sensitizer on the photo-and thermal-oxidative stability of m-LLDPE.In Fourier transform infrared spectroscopy, differential scanning calorimetry, measuring mechanical properties, melt flow rate, the thermal weight loss analysis (TGA), GPC characterized by means of the metallocene linear low density polyethylene (m-LLDPE) the traditional linear low density polyethylene (LLDPE) structure and properties that the metallocene linear low density polyethylene (m-LLDPE) with good crystallinity on the tensile and fracture properties and melt index properties, heat sealing, and high purity and other properties are superior.We study the influence that three different photosensitizing m-LLDPE film degradation reaction thermodynamics by using infrared spectroscopy and examine the impact of different photosensitizing to the m-LLDPE oxidation stability, and we study the degradation of their thermodynamic stability of the thermal oxidation by the way that we have change of mechanical properties and thermal oxidation to observe embrittlement time, by using infrared spectroscopy to analysis carbonyl index. We study the variation of m-LLDPE film photo-oxidation degradation, we add a little of photosensitizer in m-LLDPE internal, the result of light, and thermal degradation is CoSt> FeSt> FeDEC.