NDLI: Effect of molecular weight distribution on rheological, crystallization and mechanical properties of polyethylene-100 pipe resins

Content Provider	Springer Nature Link
Author	Wu, Tong Yu, Lei Cao, Ya Yang, Feng Xiang, Ming
Copyright Year	2013
Abstract	In this article, a series of commercial bimodal polyethylene-100 (PE100) resins were synthesized to clarify the effect of molecular weight distribution (MWD) on rheological, crystallization and mechanical properties of bimodal PE. The GPC results show that the three GC100S samples with similar MWD merely differ in the ratio of low molecular weight (MW) fraction which gradually ascends from 50 % to 58 %. Rheological measurements were performed to show that the low MW fraction which has the function of dilution and lubrication can obviously decline the melt elasticity and increase the onset shear rate of shark-skin failure, which dramatically improve the processability of GC100S. Furthermore, isothermal crystallization and stepwise segregation crystallization were studied by differential scanning calorimetry (DSC). It appears that the introduction of homopolymerized low molecular fraction could remarkably promote the crystallization capacity and form thick lamellae, which eventually improve the rapid crack propagation (RCP) resistance of PE100 pipe. On the other hand, uniaxial tensile test was used to evaluate slow crack growth (SCG) resistance of PE100 pipes. It shows that the concentration of intercrystalline tie molecules declines with the increasing ratio of low MW fraction, which slightly deteriorates the SCG resistance.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	20
Issue Number	10
e-ISSN	15728935
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-09-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	PE100 pipe resins Molecular weight distribution Rheological behavior Crystallization kinetics Mechanical properties Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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