Effect of LLDPE on Aging Resistance and Thermal, Mechanical, Morphological Properties of UHMWPE/LLDPE Blends

Blends of ultra-high molecular weight polyethylene (UHMWPE) and different contents (0, 10, 20 and 30 wt%) of linear low-density polyethylene (LLDPE) with and without maleic anhydride-grafted LLDPE (LLDPE-g-MA) were prepared by melt blending and aging resistance, thermal and mechanical properties were evaluated. The degree of crystallinity increases with the content of LLDPE in the blends. On the other hand, the addition of compatibilizer agent modifies the crystallinity and the crystallite size. Non-compatibilized blends have excellent impact resistance properties and the addition of LLDPE-g-MA aids processing but decrease the impact resistance of the blends. Thermal and mechanical properties were greatly affected by thermal and water aging. The thermal aging leads to an increase in the degree of crystallinity and consequent a decrease in impact resistance.

本数据集涉及的研究通过熔融共混法制备了超高分子量聚乙烯（ultra-high molecular weight polyethylene, UHMWPE）与不同含量（0、10、20和30 wt%）的线型低密度聚乙烯（linear low-density polyethylene, LLDPE）共混物，分别添加与未添加马来酸酐接枝线型低密度聚乙烯（maleic anhydride-grafted LLDPE, LLDPE-g-MA）；随后对该系列共混物的抗老化性能、热学性能与力学性能进行了表征与评价。共混物的结晶度随其中LLDPE含量的增加而升高。另一方面，相容剂（compatibilizer agent）的添加会改变共混物的结晶度与微晶尺寸。未添加相容剂的共混体系具备优异的抗冲击性能；而LLDPE-g-MA的添加虽有助于改善加工性能，却会降低共混物的抗冲击性能。热老化与水老化会显著影响材料的热学与力学性能，其中热老化会导致结晶度升高，进而使材料的抗冲击性能下降。