Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 33, Issue 4, Pages 1047-1056Publisher
WILEY
DOI: 10.1002/pat.5577
Keywords
compatibility; linear low-density polyethylene; mechanical properties; rheological properties; ultrahigh molecular weight polyethylene
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Funding
- General Program of the National Natural Science Foundation of China [21776141]
- Key Project of Natural Science Foundation of Ningbo [202003N4014]
- Opening Foundation from State Key Laboratory of Polyolefins [SKLLCTP-201803]
- Talent Project of Zhejiang Association for Science and Technology [2018YCGC014]
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The research found that miscible blends of UHMWPE and LLDPE can be obtained with a small addition amount of UHMWPE, and the mechanical properties of the blends are improved through the co-crystallization of UHMWPE, leading to significant increases in impact strength, breaking elongation, Young's modulus, and tensile strength when the addition amount of UHMWPE is 5.0 wt%.
Ultra-high molecular weight polyethylene (UHMWPE) and linear low-density polyethylene (LLDPE) with different ratios were melt-blended in an internal mixer. Results of rheological tests and scanning electron microscopy indicate that the blends are well miscible in the range of small addition amount of UHMWPE. The content of UHMWPE is suggested to be less than 5.0 wt%, to guarantee good compatibility of biphasic blends. Differential scanning calorimetry studies indicate that co-crystallization occurs between UHMWPE and LLDPE. The crystallinity increases with the increase of UHMWPE as a nucleating agent. As a result, an improvement in mechanical properties is achieved. When the addition amount of UHMWPE is 5.0 wt%, the impact strength, breaking elongation, Young's modulus, and tensile strength are significantly increased by 27%, 25%, 75%, and 21% respectively.
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