基于RHCM与CIM熔接痕形成的分子形态演化研究

doi:10.11896/cldb.18070152

Abstract
Figure/Table
References
Related Citation (8)

Download:

Full Text ( PDF ) (3123KB)
Export: BibTeX | EndNote (RIS)

Abstract Aimed at the problem of weld line during injection molding process, the initial interface model of vertical orientation was established when polymer flow fronts meet. Based on the molecular dynamic simulation method, molecular morphology evolution mechanism of poor and strong bond was researched by comparing migration and diffusion of molecular chain, chain orientation, radius of gyration and bonding energy at CIM and RHCM weld line interface. The results indicate that the molecular orientation of the surface and intermediate layer of CIM weld line is rapidly frozen with low temperature and fast cooling rate. Molecular chain motion is blocked and the diffusion rate is low. The weld line interface is ob-vious and interface bonding energy is low. The molecular morphology changes little, so the interface forming poor bond. However, RHCM weld line and the core layer of CIM weld line have a long time to maintain high temperature and the cooling rate is slow at packing stage, which is beneficial to the migration and diffusion of molecular chain and promotes the relaxation of molecular chain. Chain disorientation is obvious and the ra-dius of gyration reduces. The polymer molecular chains show winding and curling state and intertwine together at the interface. So the interface bonding energy increases and the interface forms strong bond. Therefore, the essence of molecular morphology evolution at weld line interface is the process of the relaxation and interdiffusion of oriented molecular chain. RHCM process greatly promotes the course of molecular morphology evolution and dramatically improves poor bond of weld line.

Key words： weld line molecular morphology rapid heat cycle molding conventional injection molding

Published: 31 July 2019

CLC number:

TQ320

Fund:This work was financially supported by the National Natural Science Foundation of China (51365038), the Natural Science Foundation of Jiangxi Province (20161BAB206123).

About author:: Meili Zhangis a doctoral student in material proces-sing engineering at Nanchang University, focusing on the research of the polymer micromorphology of injection molding.
Yong Xin is a second-level professor, doctoral supervisor and Doctor of Engineering (Postdoctor). He is an expert with the special allowance of the State Council, focusing on the research of polymer micro-nano structure precision molding technology. He has presided over two Natural Science Foundations of China and more than 30 provincial (ministerial) key science and technology projects. Scientific and technological achievements won 5 provincial (ministerial) science and technology progress awards. He has published more than 200 academic papers.

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHANG Meili
	XIN Yong

Cite this article:

ZHANG Meili,XIN Yong. Research on Molecular Morphology Evolution Based on Weld Line Formation of RHCM and CIM[J]. Materials Reports, 2019, 33(18): 3125-3129.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.18070152 OR http://www.mater-rep.com/EN/Y2019/V33/I18/3125

[1]	Nguyen-Chung T. Rheologica Acta, 2004, 43 (3), 240.
[2]	Kovács J G, Sikló B. Polymer Testing, 2010, 29 (7), 910.
[3]	Fellahi S, Meddad A, Fisa B, et al. Advances in Polymer Technology, 1995, 14 (3), 169.
[4]	Fathi S, Behravesh A H. Polymer-Plastics Technology and Engineering, 2008, 47 (7), 666.
[5]	Zhou Y, Mallick P K. Polymer Composites, 2011, 32(2), 268.
[6]	Wu C H, Liang W J. Polymer Engineering and Science, 2005, 45, 1021.
[7]	Ozcelik B, Kuram E, Topal M M. International Communications in Heat and Mass Transfer, 2012, 39(2), 275.
[8]	Dzulkipli A A, Azuddin M. Procedia Engineering, 2017, 184, 663.
[9]	Zhao G Q, Wang G L, Guan Y J. Journal of Plasticity Engineering, 2009, 16 (1), 190.
[10]	Marco F, Giovanni L. AIP Conference Proceedings, 2011, 1353, 797.
[11]	Zhao G Q, Wang G L, Guan Y J, et al. Polymers for Advanced Technologies, 2011, 22(5), 476.
[12]	Chen S C, Jong W R, Chang J A. Journal of Applied Polymer Science, 2006, 101(2), 1174.
[13]	Ling C J, L X Y, Fan F C, et al. Chemical Engineering Science, 2012, 84, 292.
[14]	Paul W G. Polymer, 2004, 45(11), 3901.
[15]	Shi M N, Zhang Y C, Cheng L S, et al. Journal of Physical Chemistry B, 2016, 120(37), 10018.
[16]	Zhou M Y, Jiang B Y, Weng C. Computational Materials Science, 2016, 120, 36.