首页|A Study on the Impact of Chemical Structure on the Evolution of Aggregate Structure in Fiber-shaped High Density Polyethylene Vitrimer
A Study on the Impact of Chemical Structure on the Evolution of Aggregate Structure in Fiber-shaped High Density Polyethylene Vitrimer
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Vitrimers have emerged as a prominent research area in the field of polymer materials.Most of the studies have focused on synthesiz-ing polymers with versatile dynamic crosslinking structures,while the impact of chemical structure on aggregate structure of vitrimers,particular-ly during polymer processing,remains insufficiently investigated.The present study employed commercial maleic anhydride-grafted-high densi-ty polyethylene(M-g-HDPE)as the matrix and hexanediol as the crosslinker to facilely obtain fiber-shaped HDPE vitrimers through a reaction ex-trusion and post-drawing process.Through chemical structure characterization,morphology observation,thermal and mechanical properties in-vestigation,as well as aggregate structure analysis,this work revealed the influence of dynamic bonds on the formation of aggregate structures during fiber-shaped vitrimers processing.A small amount of dynamic bonds in HDPE restricts the motion of PE chain during melt-extruding and post-drawing,resulting in a lower orientation of the PE chains.However,lamellar growth and fibril formation during post-drawing at high tem-perature are enhanced to some extent due to the competition between dynamic bond and chain relaxation.The uneven morphology of fiber-shaped HDPE vitrimers can be attributed to the stronger elastic effect brought by dynamic bonding,which plays a more dominant role in deter-mining the mechanical properties of fiber-shaped vitrimers compared to aggregate structure.
High density polyethylene vitrimerFiber-shapedAggregate structuresTransesterification reaction
Bing Wang、Yuan-Chu Gao、Hai Wang、Hui Niu
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State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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