Average mixing torque, tensile and impact properties, and thermal stability of poly(vinyl chloride)/sawdust composites with different silane coupling agents

Abstract

Unique explanations are given to describe changes in the mixing torque and tensile and impact properties of poly(vinyl chloride) (PVC)/wood sawdust composites affected by various types and concentrations of silane coupling agents. Concentrations of 0.5-1.0 and 1.5 wt % coupling agent are recommended for the optimization of the tensile and impact properties of the composites, respectively. Changes in the tensile and impact properties of the composites with a low sawdust content were more sensitive to the addition of silane coupling agents than those with a high sawdust content. KBM603 was suitable for improving the tensile properties, whereas KBE603 is recommended for high impact resistance of the composites. The differences in the mechanical and thermal properties of the PVC/sawdust composites were dependent on the characteristics of the functional groups in the silane coupling agents used, such as hydrophilic level, number of functional groups, self-condensation reaction, and effectiveness of the hydrolysis reaction. Silane coupling agents above 1.0 wt % resulted in an increase in polyene sequences in the PVC structure. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: [213][214][215][216][217][218][219][220][221] 2005

Resistance of modified polyvinyl chloride/wood flour composites to basidiomycetes

“…In addition two different aminosilanes were used to modify the wood. In contrast to the previously mentioned modifications, aminosilanes are acting as coupling agents between wood and PVC, so that besides a hydrophobic treatment, the interphase is improved (Müller et al 2012;Matuana et al 1998a,b;Sombatsompop and Chaochanchaikul 2005;Kokta et al 1990b). The majority of scientific papers focus on investigations concerning the durability of PP and PE based WPC.…”

On adhesion mechanisms and interfacial strength in acrylonitrile–butadiene–styrene/wood sawdust composites

“…The applications of the PWC products include decking, window and door profiles, automobile paneling, panel inserts, and flower pots. It is known that the mechanical and physical properties of PWC products are affected by a number of factors, such as the volume fraction and aspect ratio of fiber, fiber orientation, dispersion level, fiber-polymer adhesion, mixing time and processing temperature [1][2][3][4][5][6]. The most important role on the mechanical properties of the composites is the fiber-matrix adhesion.…”

“…Research and development of the properties of composites of ABS and natural fibers have been very rare in literature, mostly being carried out using synthetic and inorganic fibers as reinforcements [10][11][12]. Due to the incompatibility between the polymers and the natural fibers, some surface modifications, usually by the use of coupling agents, are required for the improvement of the service performances of the composite products [5]. Quyang et al [13] examined the effect of surface treatment of magnesium salt whiskers using isopropyl tri(dioctylpyrophosphoryl) titanate as a coupling agent on the mechanical properties of magnesium salt whisker/ABS composites.…”

A die rotating system for moderations of extrusion load and pressure drop profiles for molten PP and wood/polypropylene composites in extrusion processes

“…The maximum moisture content allowed was less than 5%, this being achieved using an oven at 80 C. 19 It should also be noted that it was not necessary to incorporate a coupling agent for wood treatment in this work since the chemical reaction between the coupling agent and the polymer dynamically changed during the extrusion (molten state). In addition, based on previous work by Sombatsompop and Chaochanchaikul, 20 the changes in rheological properties due to the addition of silane coupling agents were relatively small (less than 10%) as compared with those in mechanical properties of wood/thermoplastic composites.…”