PurposeThe purpose of this paper is to study the effect of monomer composition in core‐shell latex prepared from co‐polymer of styrene‐butylacrylate (BA)‐methyl methacrylate (MMA) and their paint properties.Design/methodology/approachThe core‐shell latex was prepared by a stepwise semi‐batch emulsion polymerisation. A set of dispersion was made with the different core‐shell compositions. The core phase consists of a copolymer of styrene‐BA‐acrylic acid (AA) and the shell phase consists of a copolymer of MMA‐AA. The properties of latex were determined by solid content, viscosity, pH and particle size. Subsequently, emulsion paint (PVC‐37 per cent and NVM‐53 per cent) was prepared using core‐shell latex. The paint properties were determined by block resistance, gloss, elongation at break, etc. The particle morphology was characterised with transmission electron microscope (TEM).FindingsCore‐shell structure of latex was confirmed by TEM. The performance of core‐shell latex has been optimised and the best combination achieved with 25‐40 per cent of hard phase in core‐shell latex.Research limitations/implicationsAlthough the core‐shell structured latex was prepared from co‐polymer of styrene‐BA‐MMA monomer, the system could be extended with other monomers depending on the end use of surface coating.Practical implicationsThe paint industry may use this method to improve paint properties.Originality/valueThe paper shows that, by use of core‐shell latex, it is possible to achieve high‐block resistance, hardness, elasticity and gloss.
Starch-based biodegradable low-density polyethylene (LDPE) films were used for graft copolymerization of vinyl acetate with ceric ammonium nitrate (CAN) in aqueous acidic medium as redox initiator with nitric acid. The extent of grafting was examined by Fourier-transform infrared (FTIR) spectroscopy, attenuated total reflectance (ATR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The objective behind the grafting of vinyl acetate onto the LDPE-starch biodegradable films is to make these suitable for printing and packaging applications without affecting the biodegradability of the original films.
The analysis of environmental effects on microstructure of HDPE polymers were done according to their mechanical behavior obtained from tensile, impact and microhardness testing and thermograms obtained from DSC. The samples were conditioned under three different kinds of humidity and temperature environment. With increase in conditioning time, the variations of tensile strength, impact, microhardness were observed to be nonlinear in nature. The high values are possibly due to polymerization such as cross-linking. The low values may be attributed by depolymerization mechanism such as chain scission and bond breakage. The variation of data is due to more physical damage of the polymer because of unequal expansion of the surface. The refrigeration also affects the crystalline regions by changing free volume. Again rearrangement of end groups in the lamella through partial melting and recrystallization are observed due to thermal conditioning and thermal shock.
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