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Crystallization, Structures, and Properties of Different Polyolefins with Similar Grafting Degree of Maleic Anhydride

1
Advanced Manufacturing Institute of Polymer Industry, Shenyang University of Chemical Technology, Shenyang 110142, China
2
Ningbo MaterChem Technology Co, Ltd., Ningbo 315830, China
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(3), 675; https://doi.org/10.3390/polym12030675
Received: 19 February 2020 / Revised: 12 March 2020 / Accepted: 13 March 2020 / Published: 18 March 2020
(This article belongs to the Section Polymer Physics)
Maleic anhydride (MAH) grafting to different polyolefins with similar grafting degree can have different effects on crystallization, crystal structure, and mechanical and thermal properties. The grafting leads to a smaller crystal size, less ordered lamellar structure, and a shorter long period for HDPE, LLDPE, and PP. The grafting makes PP lamellar packing less ordered the most and almost no effect to LLDPE. The grafting does not have that much impact on the crystallization ability of the HDPE, LLDPE, and HDPE/PP blend, but appreciably reduces the crystalline ability of PP-g-MAH, due to a dramatical drop in its molecular weight during the grafting process. As a result, the grafting makes PP a very brittle material with a lowered average melting point than the corresponding neat PP, but the grafting has almost no effect on elongation at break for LLDPE and some effect on HDPE (decreased by one-third). However, the PP degradation due to MAH grafting can be avoided in the presence of PE component, i.e., making the grafting of PP and PE at the same time with HDPE/PP blend. The grafted HDPE/PP blend shows a significantly improved compatibility, which leads to overall appreciably better mechanical properties than the neat HDPE/PP blend. View Full-Text
Keywords: MAH grafted polyolefins; crystallization behavior; crystal structure; mechanical properties MAH grafted polyolefins; crystallization behavior; crystal structure; mechanical properties
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Wang, Y.; Shi, Y.; Shao, W.; Ren, Y.; Dong, W.; Zhang, F.; Liu, L.-Z. Crystallization, Structures, and Properties of Different Polyolefins with Similar Grafting Degree of Maleic Anhydride. Polymers 2020, 12, 675.

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