Mechanical Morphological And Rheological Properties Of Polyamide 6 Organo-Montmorillonite Nanocomposites.

Polyamide (PA6) nanocomposites containing 4 wt% organo-montmorillonite (OMMT) were melt-compounded followed by injection molding

Effect of maleated compatibiliser (PBS-g-MA) addition on the flexural properties and water absorption of poly(butylene succinate)/kenaf bast fibre composites

Poly(butylene succinate) (PBS) composites with 30 wt.% loading of kenaf bast fibre (KBF) were compatibilised with 5 wt.% maleated PBS (PBS-g-MA). The maleic anhydride (MA) concentration in the compatibiliser was either 3, 5, 7 or 10 phr. In general, the compatibilised composites showed better flexural properties than the un-compatibilised composite. The highest increment in the flexural strength and modulus of 12.7 and 8.9%, respectively, were obtained with the addition of PBS-g-MA with MA concentration of 5 phr. Compatibilised and un-compatibilised PBS/KBF composites were immersed in distilled water for 90 days. The absorption of water by all the composites was observed to follow Fick’s law. The equilibrium moisture content, Mm, of the composites with PBS-g-MA at 3, 5 and 7 phr of MA concentrations was lower than that of the un-compatibilised composite due to improved fiber-matrix interfacial adhesion and reduction of voids content. Both un-compatibilised and compatibilised composites showed dimensional instability after the water absorption. This was probably due to the degradation of the fibre-matrix interfacial adhesion and fibre integrity. The flexural properties of these composites decreased after the water absorption. After re-drying only some of the flexural properties were recovered from plasticizing effect of water

Effect Of Organoclay Modification On The Mechanical, Morphology, And Thermal Properties Of Injection Molded Polyamide 6/Polypropylene/Montmorillonite Nanocomposites.

Polyamide 6/polypropylene (PA6/PP = 70/30 parts) blends containing 4 phr (parts per hundred resin) of organophilic montmorillonite (OMMT) were prepared by melt compounding using co-rotating twin-screw extruder followed by injection molding

PREPARATION AND PROPERTIES OF PA6/PP/ORGANOCLAY NANOCOMPOSITES OBTAINED BY MELT COMPOUNDING

Nanocomposites based on polyamide 6/polypropylene (PA6/PP = 70/30 parts), containing 0, 2, 4, 6, 8, 10 phr of organoclay, and maleic anhydride grafted polypropylene (PP-g-MA) as a compatibilizer were prepared by melt compounding using counter-rotating twin-screw extruder followed by injection molding. X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to characterize the structure of nanocomposites. The mechanical properties of the nanocomposites were determined by tensile test. XRD and TEM results indicated the formation of the exfoliated nanocomposites at low organoclay content (up to 4 phr), and a mixture of intercalated and exfoliated nanocomposites at high organoclay content (10 phr). The PP-g-MA addition yielded finer dispersion of nanoclay than without compatibilizer. Tensile modulus increased with increasing organoclay conten

Synthesis and Characterization of Liquid Natural Rubber as Impact Modifier for Epoxy Resin

AbstractLiquid natural rubber (LNR) with a molecular weight Mn =16×103 was prepared by the depolymerization of deproteinized natural rubber latex (DPNR). The liquid natural rubber (LNR) was characterized by FTIR and H’NMR spectroscopic analysis. LNR was premixed with the epoxy resin (EP) and cured with a diamine curing agent for 1 h at 100°C and post cured at 110°C, for 2 h in air oven. The modified EP containing different contents of LNR (5, 10, 15 and 20 phr) were evaluated. Thermal, mechanical and morphology properties were determined. The fracture toughness (KIC) of both unmodified and modified EPs were determined on static loaded single edge notched (SEN-B) specimens at room temperature. The glass transition temperatures (Tg) of the modified EPs were decreased with increasing LNR content. The strengths and modulus of EPs were slightly reduced with the incorporation of LNR. The effect was also reflected in the significant increase in the tensile strain of modified EP. Fracture toughness of the EP was observed to increase with the presence of LNR. The toughening effect became more apparent as the testing speeds were increased from 1 to 500 mm/min. Fracture surface analysis by scanning electron microscopy (SEM) revealed the presence of a two-phase morphology