Abstract: Ethyleneoctene copolymer (thermoplastic elastomer POE) was used to improve the heat sealing temperature and tensile strength of the low density polyethylene(PE-LD). Metallocene polyethylene (mPE) was used to increase heat seal strength of PE-LD. High density polyethylene (PEHD) was used to increase tensile strength of PE-LD film. The transverse tensile strength, longitudinal tensile strength, and heat seal strength of the film increased 17.21、29.73 MPa, and 16.11 N/15 mm, respectively, while the outer layer of the film was PE-LD, and the middle layer was PE.LLD(7042)∶PE.HD=70∶30, and the inner layer was PE-LLD(7050)∶PE-LD∶ POE(9361)∶mPE(M4707EP)=10∶80∶5∶5.

Key words: LDPE, modification, POE, mPE, HDPE