Search Results

You are looking at 1 - 10 of 304 items for :

  • Refine by Access: All Content x
Clear All

Introduction The poly-vinyl-chloride (PVC) is a widely used commodity polymer because of its excellent properties; such as high stiffness, good transparency, low flammability and favourable price. PVC is recyclable, but

Restricted access

Abstract  

The thermal degradation of poly(vinyl acetate) (PVA), poly(vinyl alcohol) (PVAL), vinyl acetate-vinyl alcohol (VAVAL), vinyl acetate-vinyl-3,5-dinitrobenzoate (VAVDNB) and vinyl alcohol-3,5-dinitrobenzoate (VALVDNB) copolymers have been studied using differential thermal analysis (DTA) and thermogravimetry (TG) under isothermal and dynamic conditions in nitrogen. Thermal analysis indicates that PVA and PVAL are thermally more stable than VAVAL copolymers, being PVAL the most stable polymer. The presence of small amounts of vinyl-3,5-dinitrobenzoate (VDNB) in PVA or PVAL produces a marked decrease in the thermal stability of both homopolymers, being VALVDNB copolymers the less stable materials. The apparent activation energy of the degradative process was determined by the Kissinger and Flynn-Wall methods which agree well.

Restricted access

thickener in textile and slurry explosives. Fig. 2 Structural presentation of xanthan gum Similarly, acrylamide, methacrylamide, acrylic acid, N -vinyl formamide, N -vinyl-2

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: M. I. Loría-Bastarrachea, W. Herrera-Kao, J. V. Cauich-Rodríguez, J. M. Cervantes-Uc, H. Vázquez-Torres, and A. Ávila-Ortega

Introduction Poly( N -vinyl-2-pyrrolidone), PVP, has been attracted a great deal of attention in these days as it has been widely used for applications in various fields. This polymer is a synthetically derived vinyl polymer

Restricted access

Abstract  

Vinyl siding is typically produced by co-extruding a capstock (surface layer) over a PVC substrate formulation. The capstock is often non-PVC, these systems can result in warpage during or after production. In our study we will show that this warpage can result from an interfacial induced stress related to the mismatch between the glass transition of the substrate and the capstock. Additionally, both TMA and TMDSC were used to probe the stress release. Capstock formulations which better match the glass transition of the PVC substrate result in superior performance.

Restricted access

natural fibres [ 6 ]. The matrix selected in this study was poly(vinyl chloride) (PVC). It is one of the most well-known and the least expensive thermoplastic polymers. This thermoplastic is used in a broad range of applications, and its use has

Restricted access

Introduction For many years, poly(vinyl chloride) (PVC) has been one of the most important technical polymers that have wide applicability specially in medicine due to its easy modification by various additives, such as

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: M. F. Silva, E. A. G. Pineda, A. A. W. Hechenleitner, D. M. Fernandes, M. K. Lima, and P. R. S. Bittencourt

studies of PVA-Lignin systems [ 17 – 20 ] in which lignin also showed stabilizing effects, in this study the authors focused on lignin incorporation to poly (vinyl acetate) (PVAc). PVAc is a thermoplastic with good adhesion to different substrates and also

Restricted access

Thermal degradation of ethylene (vinyl acetate)

Kinetic analysis of thermogravimetric data

Journal of Thermal Analysis and Calorimetry
Authors: M. L. Marín, A. Jiménez, J. López, and J. Vilaplana

Ethylene (vinyl acetate), EVA, is a copolymer which is thermally degraded at high temperatures, with acetic acid release at approximately 620 K. This release can be studied by using thermal methods, and in particular thermogravimetric analysis.

Restricted access

chloride (PVC) [ 10 – 14 ]. Among these, the markets for wood flour-poly(vinyl chloride) composites (WF-PVC) are increasing dramatically, with a growth perspective of 200% from 2002 to 2010[ 1 ]. They are now typically used in building construction

Restricted access