Process optimization for improved adhesion in the grafting of triethoxyvinylsilane on VLDPE via reactive extrusion

Schaible, Stefan; Meincke, Olaf; Schulthess, Adrian; Brändli, Christof

doi:10.1016/j.eurpolymj.2018.07.046

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Process optimization for improved adhesion in the grafting of triethoxyvinylsilane on VLDPE via reactive extrusion
Authors:	Schaible, Stefan Meincke, Olaf Schulthess, Adrian Brändli, Christof
DOI:	10.1016/j.eurpolymj.2018.07.046
Published in:	European Polymer Journal
Volume(Issue):	107
Page(s):	9
Pages to:	14
Issue Date:	27-Jul-2018
Publisher / Ed. Institution:	Elsevier
ISSN:	0014-3057
Language:	English
Subjects:	Reactive extrusion; Adhesive; Silane; Grafting; VLDPE
Subject (DDC):	660: Chemical engineering
Abstract:	The grafting of triethoxyvinylsilane (TEVS) onto very low density polyethylene (VLDPE) via reactive extrusion was investigated with an emphasis on the temperature and amount of initiator used for the reaction. Two different peroxides (Luperox 101 and Peroxan PK 295P) were used as single initiators for the grafting reaction with and without an additional thermal stabilizer. Infrared spectra of the resulting polymers showed that grafting efficiency was high over the analysed temperature range from 120°C to 210°C. A new and more sensitive method, based on head space gas chromatography with mass spectrometry (head space GC–MS), was used to determine optimal grafting efficiencies. Above 160°C, the grafting efficiency for both initiators was greater than 80%. In general, grafting with the more reactive peroxide (P295) yielded more highly functionalized polymers. Optimization of the grafting process reduces the amount of unreacted grafting material, minimizing levels of free volatile components and reducing energy consumption. Melt viscosities were also analysed to identify unwanted side reactions. In general, compared to polymers produced with P295, those made with Luperox 101 exhibited more rapidly increasing complex viscosity with increasing amounts of initiator. T-peel adhesion tests were used to demonstrate the use of silane-grafted VLDPE as an adhesive on metal substrates. The T-peel strengths of modified VLDPE samples were between 0.6 and 2.6 N/mm, depending on the process conditions and the choice of initiator. The T-peel strength of Peroxan PK 295P was less dependent on initiator content, resulting in a more robust system for use in reactive extrusion technologies.
URI:	https://digitalcollection.zhaw.ch/handle/11475/13213
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Materials and Process Engineering (IMPE)
Appears in collections:	Publikationen School of Engineering

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Schaible, S., Meincke, O., Schulthess, A., & Brändli, C. (2018). Process optimization for improved adhesion in the grafting of triethoxyvinylsilane on VLDPE via reactive extrusion. European Polymer Journal, 107, 9–14. https://doi.org/10.1016/j.eurpolymj.2018.07.046

Schaible, S. et al. (2018) ‘Process optimization for improved adhesion in the grafting of triethoxyvinylsilane on VLDPE via reactive extrusion’, European Polymer Journal, 107, pp. 9–14. Available at: https://doi.org/10.1016/j.eurpolymj.2018.07.046.

S. Schaible, O. Meincke, A. Schulthess, and C. Brändli, “Process optimization for improved adhesion in the grafting of triethoxyvinylsilane on VLDPE via reactive extrusion,” European Polymer Journal, vol. 107, pp. 9–14, Jul. 2018, doi: 10.1016/j.eurpolymj.2018.07.046.

SCHAIBLE, Stefan, Olaf MEINCKE, Adrian SCHULTHESS und Christof BRÄNDLI, 2018. Process optimization for improved adhesion in the grafting of triethoxyvinylsilane on VLDPE via reactive extrusion. European Polymer Journal. 27 Juli 2018. Bd. 107, S. 9–14. DOI 10.1016/j.eurpolymj.2018.07.046

Schaible, Stefan, Olaf Meincke, Adrian Schulthess, and Christof Brändli. 2018. “Process Optimization for Improved Adhesion in the Grafting of Triethoxyvinylsilane on VLDPE via Reactive Extrusion.” European Polymer Journal 107 (July): 9–14. https://doi.org/10.1016/j.eurpolymj.2018.07.046.

Schaible, Stefan, et al. “Process Optimization for Improved Adhesion in the Grafting of Triethoxyvinylsilane on VLDPE via Reactive Extrusion.” European Polymer Journal, vol. 107, July 2018, pp. 9–14, https://doi.org/10.1016/j.eurpolymj.2018.07.046.