Studies on the polyblends of poly(vinyl chloride) with various methacrylate copolymers, physical and mechanical properties. I

Abstract

SynopsisThe effect of blending various methacrylate copolymers on the physical and mechanical properties of poly(viny1 chloride) (PVC) has been investigated. Copolymers of methylmethacrylate with methylacrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate in 80 : 20 and 50 : 50 wrt methylmethacrylate have been prepared and characterized by nuclear magnetic resonance spectroscopy. Polyblends of PVC and such polyacrylates have been prepared in 80 : 20 ratio by melt blending technique and characterized by thermomechanical analysis to study the glass transition behavior v i s -h i s the compatibility of these blends. Mechanical properties of these blends revealed a substantial increase in impact strength particularly when long chain acrylate polymers like butyl acrylate and 2-ethyl hexyl acrylates are used; however, there is a decrease in the yield stress and initial modulus. A shift from brittle failure to ductility has been observed in blends of PVC on incorporation of these acrylate copolymers. Scanning electron microscopic studies have been carried out to support these observations.

Physical, mechanical, and thermal properties of PVC/PMMA blends in relation to their morphologies

“…The process of blending certain other polymeric materials, which are referred to as impact modifiers and processing aids, offers a unique tool for overcoming the deficiencies of PVC as mentioned above without much loss in the mechanic. [1][2][3][4] The most important types of such polymeric modifiers are the acrylates, the incorporation of which is expected to act both as processing aid as well as impact modifiers. 5 The incorporation of acrylates in PVC is analogous to the rubber toughening of glassy polymers, as these are well known to be rubbery in character, having glass transition temperatures close to or below room temperature.…”

Modification of porous PVC particles with polyacrylate elastomers using a surfactant-free aqueous dispersion polymerization technique

“…Accordingly, the inherent problems of poor impact strength and difficult processing of rigid polyvinyl chloride (PVC) have been reported to be overcome through the process of blending with certain other polymeric materials which are referred to as impact modifiers and processing aids [2]. Since in these blends the identity of the components is preserved, performance characteristics depend on size and shape of the component phases [1].…”

“…The formation of semi-IPN is generally known to enable control of phase separation [7], promote compatibility between immiscible polymer pairs [7][8][9][10], and thus provide a method for generation of desired properties. 2 In the present study, a route for producing semi-IPNs based on PVC and polybutyl acrylate (PBA), or polyethylhexyl acrylate (PEHA), crosslinked with ethylene glycol dimethacrylate (EGDMA) is described. The semi-IPNs are prepared by an in-situ stabilizer-free polymerization/crosslinking of a monomer/crosslinker/peroxide solution absorbed within the porous commercial suspension-type PVC particles.…”

“…Efficient impact modifiers for PVC are immiscible with PVC aiming at formation of discrete domains, and having a strong interfacial bonding to the matrix to permit efficient stress transfer across the interface [3]. Impact strength has been reported to have increased by mixing under appropriate conditions of certain acrylic polymers and copolymers with PVC [2,4,5].…”

Studies on engineering properties of PVC–PMMA semi‐interpenetrating polymer networks

“…In our case, we have tried to modify both linear and crosslinked PVC with PMMA (having very high chain stiffness and rigidity) so that the mechanicals of the blends can be kept at par with original PVC or even better. [7][8][9][10][11] . Also, PMMA having a solubility parameter (␦ ϭ 9.27 cal/c.c 1/2 ) very close to that of PVC (␦ ϭ 9.47cal/c.c 1/2 ) might be expected to have a very good compatibility with PVC.…”