Poly(vinyl chloride) and wood flour press mould composites: New bonding strategies

Abstract

In this work, different strategies for improving the association between hydrophilic wood flour surfaces and poly(vinyl chloride) (PVC) hydrophobic surfaces were tested. Three new coupling agents, based on living radical polymerisation (LRP), involving PVC were synthesised and tested in formulations with PVC and wood flour. The melt mixing behaviour was analysed in terms of the torque exerted by the mixing blades and related to the structural properties of the mixture. These products were ground and sheets were produced by press moulding. The composites were characterised by dynamic mechanical analysis. It was found that the use of a new block copolymer poly(vinyl chloride)-b-poly(hydroxypropyl acrylate)-b-poly(vinyl chloride), prepared by LRP, increases the elastic modulus of the composite, under controlled conditions, involving the use of specific amounts of the copolymer.

Synthesis of amphiphilic PVC-b-poly(hydroxypropyl acrylate) (PHPA)-b-PVC block copolymers with low PHPA contents and different molecular weights by (Single Electron Transfer)-(Degenerative Chain Transfer) living radical polymerization

“…They show that whether the composition of the block copolymers is based on the content of carbon or the content of oxygen, the obtained results have relatively low standard deviations. The amounts of PHPA in these copolymers are close to the expected values, and the deviations from the theoretical predictions are relatively small when compared, for example, with those for PVCb-PHPA-b-PVC block copolymers that are designed to have greater contents of PHPA [18].…”

Synthesis of random and block copolymers of vinyl chloride and vinyl acetate by RAFT miniemulsion polymerizations mediated by a fluorinated xanthate

“…In the past two decades, PVC based block copolymers have attracted more attention since they have unique structures and many potential applications (i.e., preparing elastomers without adding of plasticizers, using as compatibilizers in PVC composites). Controlled/living radical polymerization (CLRP) is the main approach to synthesize PVC based block copolymers, although CLRP of VC has been a challenge for a long time since VC is a less active monomer with a great chain transfer rate of growing radicals to VC monomer.…”

Investigation of the rheological, dynamic mechanical, and tensile properties of single‐walled carbon nanotubes reinforced poly(vinyl chloride)

“…[9][10][11][12] The performance properties of these types of composite can be related to the degree of association with the polymer, depending strongly on the composition of the CNTs, as determined by its nature. 13 Different polymer/CNTs nanocomposites have been synthesized by incorporating CNTs into various polymer matrices, such as polyamides, 14 polyimides, [15][16][17] epoxy, 18 polyurethane, 19,20 polypropylene, [21][22][23] and PVC. 11 The rheological behavior of polymer nanocomposites as a function of filler content is of great importance in polymer processing, particularly for the analysis and design of processing operations, as well as understanding structure property relationships of polymer nanocomposites.…”