Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE The regeneration strategy of gradient blending and melt filtration for postindustrial waste HDPE/LLDPE films was proposed. And the physical properties and volatile organic compounds of recycled polyethylene particles were systematically characterized.

ABSTRACT
The exponential growth in industrial waste polyethylene films consumption has elevated plastic waste management to a critical challenge in environmental sustainability and circular economy strategies. This study delineates a closed loop regeneration strategy for postindustrial waste polyethylene films, integrating systematic characterization of recycled particle physical properties and volatile organic compounds (VOCs) emission profiles. The results show that the melt flow index (MFI) of recycled high-density polyethylene (HDPE) is 0.22–0.26 g/10 min, and the MFI range of recycled linear low-density polyethylene (LLDPE) is 1.72–1.88 g/10 min. The elongation at break of HDPE is 103.8%–152.7%, while that of LLDPE is 389.8%–471.5%. And the main components of VOCs are nonanoic acid, dodecanol, hexanoic acid, methyl salicylate, menthol, decanal, and 2-ethylhexanol, which are not hazardous substances. Meanwhile, under the conditions of gradient blending at different ratios (1:3, 2:2, 3:1, etc.) and melt filtration with a 150 mesh filter screen, the synergism between HDPE and LLDPE is engineered to achieve optimized mechanical equilibrium and enhanced melt processability. These findings provide mechanical insights for closed loop recycling of polyolefin waste and address key knowledge gaps in sustainable polymer remanufacturing. This study provides sustainable practices to support the circular polymer economy.