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Processes 2017, 5(3), 43; doi:10.3390/pr5030043

Rheology of Green Plasticizer/Poly(vinyl chloride) Blends via Time–Temperature Superposition

1
Department of Chemical Engineering, McGill University, 3610 University St, Montréal, QC H3A 0C5, Canada
2
Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Ave., New Haven, CT 06511, USA
3
Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montréal, QC H3A 0C3, Canada
*
Author to whom correspondence should be addressed.
Received: 12 May 2017 / Revised: 29 July 2017 / Accepted: 31 July 2017 / Published: 7 August 2017
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Abstract

Plasticizers are commonly added to poly(vinyl chloride) (PVC) and other brittle polymers to improve their flexibility and processing properties. Phthalate plasticizers such as di(2-ethylhexyl phthalate) (DEHP) are the most common PVC plasticizers and have recently been linked to a wide range of developmental and reproductive toxicities in mammals. Our group has developed several replacement compounds that have good biodegradation kinetics, low toxicity profiles, and comparable plasticizer properties to DEHP. Knowledge of the rheology of PVC–plasticizer blends at elevated temperatures is crucial for understanding and predicting the behavior of the compounds during processing. In this work, the time–temperature profiles of PVC blended with our replacement green plasticizers—succinates, maleates, and dibenzoates, of varying alkyl chain length—are compared to blends prepared with DEHP and a commercially available non-phthalate plasticizer, di(isononyl cyclohexane-1,2-dicarboxylate) (Hexamoll® DINCH®). The relationship between the plasticizer molecular structure and viscoelastic response was examined by applying time–temperature superposition. All compounds except the diethyl esters showed a comparable viscoelastic response to DEHP and Hexamoll® DINCH®, and dihexyl succinate exhibited the most effective reduction of the storage modulus G′. All of the dibenzoate blends exhibited a lower stiffness than the DEHP blends. These experiments help to show that the green plasticizers described herein are viable replacements for DEHP, providing a less toxic alternative with comparable processing and rheological performance. View Full-Text
Keywords: poly(vinyl chloride) (PVC); blends; green plasticizers; rheology; time–temperature superposition; extrusion poly(vinyl chloride) (PVC); blends; green plasticizers; rheology; time–temperature superposition; extrusion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jamarani, R.; Erythropel, H.C.; Burkat, D.; Nicell, J.A.; Leask, R.L.; Maric, M. Rheology of Green Plasticizer/Poly(vinyl chloride) Blends via Time–Temperature Superposition. Processes 2017, 5, 43.

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