Surface Treatment and Adhesive Bonding of Commercial PVC
Dahaghi, Mojtaba 2013. Surface Treatment and Adhesive Bonding of Commercial PVC. PhD Thesis University of East London School of Architecture, Computing and Engineering https://doi.org/10.15123/PUB.4006
The bonding of rigid PVC to a plasticised PVC film using a reactive hot melt
Before surface modification of the PVCs, the PVC samples were investigated by employing surface analysis’s techniques such as X-ray photoelectron spectroscopy (XPS), contact angle measurements (CAM), atomic force microscopy (AFM) and energy dispersive X-ray (EDX) and DMA. In order to avoid the damage of the PVC samples while they expose to X-ray irradiation. Initially, XPS and EDX were employed in a X-ray degradation study of PVC to determine the maximum time a PVC sample can be exposed to an X-ray source where X-ray has minimum effect on the surface of PVC.
EDX analysis of a pure PVC specimen exposed to an X-ray source showed 5% degradation after ten minutes X-ray exposure. Additionally, a further degradation study was undertaken in which a 1mm diameter gold disc was sputter coated on to PVC sample surfaces. This study revealed that the PVC concentration decreased due to Xray degradation, however, the Au/C ratio remained constant suggesting there was no redisposition of C on to the PVC samples.
A liquid propane gas (LPG) based flame treatment was used to modify the surface of rigid PVC (Veka) to improve its wettability and its adhesive properties. The surface properties and chemistry of the modified surface were characterised by CAM, XPS and AFM. Results show that the LPG flame treatment of the PVC (Veka and Rehau) produces both morphological and compositional changes of the surface. LPG flame treatment of the PVC V and R resulted in an increase in the surface free energy of the
The penetration of PU in to the PVC increased after LPG flame treatment of the PVC due to changing surface roughness of PVC by flame treatment.
In order to study the mechanical property of sandwich layer samples, made of (Rigid PVC/PU adhesive/ Plasticised PVC), with different curing system the Dynamic mechanical analysis (Three point bending/ DMA) of all sandwich layer samples were carried out nineteen months after they have bonded together. The result obtained from DMA results shows 10% increase on loss modules test of sandwich layers, which bonded while prima was applied on the surface of the PVC.
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|23 Feb 2015
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