Phenol‐modified polypropylenes as adhesion promoters in glass fiber–reinforced polypropylene composites

Abstract

This publication is based on research work done on functional phenolmodified polypropylenes (PPs) as adhesion promoters in glass fiber-reinforced PP composites. The glass fiber roving was first impregnated with different combinations of functional polymers and polypropylene in a melt impregnation die attached to an extruder to obtain prepreg. The prepreg was then tested in many ways both macro-and micromechanically. The tests included notched tensile tests, optical and electron microscopy, and DMTA (dynamic mechanical thermal analyzer) and DSC (differential scanning calorimetry) analyses as well as determination of the glass content. The tests were run on prepregs containing pure PP, PP with a commercial adhesion promoter, and PP with a number of functional, mostly phenol-based, polymers. Also, single-fiber tests were performed on individual glass fibers to test the level of adhesion with the above-mentioned material combinations. With these tests it could be seen that some of the phenol-based functional polymers provided the prepreg with better adhesion between the fibers and the matrix than did the commercial adhesion promoter. Optical and electron microscopy also were used in determining the level of adhesion as well as the deformation and fracture mechanisms of the prepreg.

Mechanical properties of injection molded long fiber polypropylene composites, Part 1: Tensile and flexural properties

“…To improve the adhesion between glass fiber and thermoplastic resin, compatibilizers like maleic anhydride grafted polypropylene (PP), acrylic acid grafted PP, dendritic polymers, and phenol grafted PP are generally used in small proportions [9]. Reliable control of the degree of adhesion between fiber and matrix is required for using the composite as a structural material.…”

Development of Long Glass Fiber Reinforced Polypropylene Composites: Mechanical and Morphological Characteristics

“…A significant amount of research work is reported these days on injection molding of long fiber reinforced thermoplastic pellets to make long fiber composites [8][9][10][11][12][13]. In order to improve the adhesion between glass fiber and thermoplastic resin, coupling agents like maleic anhydride grafted polypropylene, acrylic acid grafted polypropylene, dendritic polymers, and phenol grafted polypropylene [14] were generally used in small proportions. Reliable control of the degree of adhesion between fiber and matrix is required for using the composite as a structural material.…”

Physical and mechanical properties of nano-CaCO3/PP composites modified with acrylic acid

“…In recent years, much attention has been paid to compatibilising technology using polymeric compatibilisers, which has proved to be an effective way to modify polymer composites. [24][25][26][27][28][29][30][31] Using reactive polar monomers, such as acrylic acid, to cover the surface of the filler, and in situ synthesise functionalised polymeric coupling agent in the preparation process of materials is more effective in improving the interfacial adhesion between filler and matrix. The polymeric coupling agent can not only improve the dispersion of the filler in the polymeric matrix, but also strengthen the adhesion between the filler and the polymer matrix.…”