Toughening effect of maleic anhydride grafted linear low density polyethylene on linear low density polyethylene
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The blend of linear low density polyethylene (LLDPE) and maleic-anhydride grafted LLDPE with the grafting degree of 1.3% and the gel content of 27.0% (designated as LLDPE/MA-PE) was melt-compounded. Their thermal, rheological, and mechanical properties were studied. The crystallization temperature and crystallization rate of LLDPE/MA-PE blends increase due to the nucleation of MA-PE, their crystallinity is between those of LLDPE and MA-PE due to the balance between the nucleation of MA-PE and simultaneously produced more defects. The addition of MA-PE increases the apparent viscosity of blend melts, but the shear-sensitivity of blends provides them with melting processing. Interestingly, the lamellar crystallites induced by MA-PE decrease the tensile yielding strength of LLDPE/MA-PE blends. During the impact fracture, the formation of oriented crystalline lamellae parallel to the crack front and perpendicular to the crack flank, leads to the deformation and microstriations in LLDPE/MA-PE blends. Subsequently, toughness of LLDPE/MA-PE blends is improved.
KeywordsApparent Viscosity LDPE Maleic Anhydride LLDPE Polarize Optical Microscope
The authors are grateful for the financial support of National Natural Science Foundation of China (50573026) and Program for New Century Excellent Talents in Universities of China (NCET-05–0640). As visiting professor of the Centre for Advanced Materials Technology (CAMT), the University of Sydney, XLX thanks Prof. Yiu-Wing Mai’s academic guidance and help.
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