RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES

Bibliographic Details
Main Author:	Guo, Haochen
Language:	English
Published:	Case Western Reserve University School of Graduate Studies / OhioLINK 2020
Subjects:	Polymers
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=case1585673886043802

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-case15856738860438022021-08-03T07:14:07Z RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES Guo, Haochen Polymers The low properties of recycled polymers associated with the high cost of recycling hinders development of the thermoplastic recycling industry. Dynamic crosslinking of recycled thermoplastics with the formation of vitrimers enables superior mechanical properties, good reprocessability as well as superior chemical and environmental resistance. Herein, a poly (ethylene-vinyl acetate) (EVA) vitrimer was formed by crosslinking with triethyl borate with the catalyst (bis(acetylacetonato) dioxo-molybdenum (VI)). The resultant EVA vitrimer shows enhanced thermal stability and mechanical properties with up to two times improvement in Young’ modulus and storage modulus by comparison with the thermoplastic EVA. Moreover, 90 % of Young’s modulus was maintained in the EVA vitrimer after five times of recycling, whereas only 72 % can be maintained for recycling the thermoplastic EVA. This dynamic crosslinked EVA also exhibits superior UV and solvent resistance, which helps to extend the service time of the recycled material. This work introduces a facile and efficient method to recycle and reuse EVA with low property loss. It has potential to enable the production of high-performance EVA from EVA waste for different applications.A self-segregated structure EVA vitrimer-CNS composite was fabricated with thermoplastic EVA-CNS and EVA vitrimer through melt-mixing. The resultant system displays a self-segregated structure with more than two times higher elongation at break by comparison with the original EVA vitrimer. Moreover, two other methods – filler/vitrimer melt mixing and post vitrimer reaction of the EVA/CNS were used to fabricate EVA vitrimer-CNS composites. The self-segregated structure EVA vitrimer-CNS composite has superior electrical conductivity and similar Young’s modulus compared with the other two sets composites. The proposed method of obtaining a segregated filler network in a vitrimer composite has potential to enable high electrical conductivity and high flexibility making it promising for different applications. 2020-06-01 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1585673886043802 http://rave.ohiolink.edu/etdc/view?acc_num=case1585673886043802 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Polymers
spellingShingle	Polymers Guo, Haochen RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES
author	Guo, Haochen
author_facet	Guo, Haochen
author_sort	Guo, Haochen
title	RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES
title_short	RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES
title_full	RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES
title_fullStr	RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES
title_full_unstemmed	RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES
title_sort	recycling thermoplastic eva (polyethylene-co-vinyl acetate) with improved properties
publisher	Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate	2020
url	http://rave.ohiolink.edu/etdc/view?acc_num=case1585673886043802
work_keys_str_mv	AT guohaochen recyclingthermoplasticevapolyethylenecovinylacetatewithimprovedproperties
_version_	1719456893627269120

RECYCLING THERMOPLASTIC EVA (POLYETHYLENE-CO-VINYL ACETATE) WITH IMPROVED PROPERTIES

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