![]() ![]() However, there exists challenging or unanswered questions for biopolymers to be used in biomedical, film packaging, automobile, construction and commercial industries such as their mechanical performance, thermal and fire retardancy, and durability when exposed to water. Good polymer−filler adhesion leads to a better state of filler dispersion in the polymer matrix as evident from the " effective free-space length (L f *) " of the transmission electron microscopy analysis, wide-angle X-ray diffraction, field emission scanning electron microscopy, and atomic force microscopy study of the nanocomposites.īiopolymers provide potential substitution to synthetic polymers derived from scarce petroleum materials which are not environmental friendly and biodegradable. The rheology study of nanocomposites help understand the polymer−filler interaction. The synergistic mechanical properties of covalently poly(ε-caprolactone)-modified HNT nanocomposites come from the ameliorated polymer−filler interface interaction that can be understood by the study of the " Pukánszky model " and dynamic mechanical analysis. Fourier transform infrared spectroscopy, X-ray diffreaction, high-resolution transmission electron microscopy, and water contact angle measurement manifests a successful organic covalent modification of the HNT surface. The covalent modification of the outer and inner lumen structures of HNTs were pursued by two different methods: in-situ ring opening polymerization of ε-caprolactone and silane modification using organosilane (3-aminopropyl)triethoxysilane. Nanocomposites of chlorinated polyethylene/ethylene methacrylate copolymer (60/40 ratio) with augmented polymer−filler interface adhesion were prepared by following a facile covalent modification of halloysite nanotubes (HNTs). Tungsten sulphide powder acts as a lubricant here, which increases the high temperature processing properties of the blend Storage modulus, tensile modulus and tensile strength were increased significantly with the incorporation of MHNTs. Thermogravimetric analysis shows that the higher thermal stability of PEEK/LCP in presence of modified HNT. FESEM image shows a better fibril formation of LCP phase within PEEK matrix in presence of MHNT. Dispersion of modified HNT in PEEK/LCP matrix was shown by high resolution transmission electron microscopy (HRTEM) and also by field emission scanning electron microscopy (FESEM). All the batches of this nanocomposite were prepared by melt blending. We have also prepared tungsten sulphide powder and introduced it into the Poly Ether Ether Ketone /Liquid Crystalline Polymer blend along with modified Halloysite nanotube (MHNT). Some of the properties of 450G and 150G are compared in the table below to illustrate these differences.Halloysite nanotube (HNT-OH) was modified organically using N-(2-aminoethyl)-3- aminopropyltrimethoxysilane (APTMS).This modification converts HNT-OH directly to HNT-NH2 and improves its dispersion in polar polymer matrix. This is a consequence of the shorter polymer chains, which are less entangled, crystallise more readily and to a greater overall extent. However, the lower molecular weight also changes the bulk properties of the polymer: lower molecular weight PAEKs have higher stiffness and strength combined with reduced toughness, ductility and impact resistance. As a result, 150G may be more suitable for applications where lower viscosity in the melt during processing is desirable, for example, when injection moulding thin-walled parts or long, thin sections with intricate geometries impregnating carbon or glass fibres for composite prepregs or adding high levels of solid fibrous or particulate fillers and reinforcements to make compounds. VICTREX PEEK 150G is a higher flow, lower molecular weight, lower MV grade of PEEK compared to 450G. Other VICTREX PEEK grades are available with higher and lower melt viscosities and higher or lower molecular weights respectively. VICTREX PEEK 450G is defined as a standard melt viscosity (MV) PEEK grade, with a medium molecular weight. ![]()
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