Plastisol foaming process. Decomposition of the foaming agent, polymer behavior in the corresponding temperature range and resulting foam properties

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Title: Plastisol foaming process. Decomposition of the foaming agent, polymer behavior in the corresponding temperature range and resulting foam properties
Authors: Verdu, Jacques | Zoller, Agnes | Marcilla, Antonio
Research Group/s: Procesado y Pirólisis de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química
Keywords: Plastisol | Decomposition | Azodicarbonamide
Knowledge Area: Ingeniería Química
Issue Date: Aug-2013
Publisher: Wiley
Citation: Polymer Engineering & Science. 2013, 53(8): 1712-1718. doi:10.1002/pen.23430
Abstract: The decomposition of azodicarbonamide, used as foaming agent in PVC—plasticizer (1/1) plastisols was studied by DSC. Nineteen different plasticizers, all belonging to the ester family, two being polymeric (polyadipates), were compared. The temperature of maximum decomposition rate (in anisothermal regime at 5 K min−1 scanning rate), ranges between 434 and 452 K. The heat of decomposition ranges between 8.7 and 12.5 J g−1. Some trends of variation of these parameters appear significant and are discussed in terms of solvent (matrix) and viscosity effects on the decomposition reactions. The shear modulus at 1 Hz frequency was determined at the temperature of maximum rate of foaming agent decomposition, and differs significantly from a sample to another. The foam density was determined at ambient temperature and the volume fraction of bubbles was used as criterion to judge the efficiency of the foaming process. The results reveal the existence of an optimal shear modulus of the order of 2 kPa that corresponds roughly to plasticizer molar masses of the order of 450 ± 50 g mol−1. Heavier plasticizers, especially polymeric ones are too difficult to deform. Lighter plasticizers such as diethyl phthalate (DEP) deform too easily and presumably facilitate bubble collapse.
URI: http://hdl.handle.net/10045/40348
ISSN: 0032-3888 (Print) | 1548-2634 (Online)
DOI: 10.1002/pen.23430
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2012 Society of Plastics Engineers
Peer Review: si
Publisher version: http://dx.doi.org/10.1002/pen.23430
Appears in Collections:INV - GTP3 - Artículos de Investigación sobre Pirólisis Catalítica de Polímeros

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