000			01615nam a2200181Ia 4500
008			220216s9999 xx 000 0 und d
100			_aNagarajan P
245		0	_aLatex interpenetrating polymer networks based on polyacrylates and polystyrene. II. Effect of methacrylic acid concentration in the seed
260			_bJournal of Applied Polymer Science _c1996
300			_a197-202
520			_aLatex interpenetrating polymer networks (LIPNs) were prepared by swelling the polyacrylate seed (comprised of methyl methacrylate and n-butyl acrylate in the ratio of 45 : 55 by weight), having different amounts of methacrylic acid (MAA) ranging from 0 to 6 wt;, with styrene monomer, whose polymer constituted the other network, to study the effect of MAA content in the seed on the final latex properties. The swelling and polymerization of styrene monomer and the crosslinker were done at two different pH values (viz. 3.3 and 8.5) for all the LIPNs. The LIPNS with the minimum MAA amount of 1.2 in the seed yielded translucent film at low pH and transparent film film at high pH, upon drying at ambient temperatures. The LIPNs showed multiphase morphology with seeds having minima of 0.2 and 0.5;MAA when processed at high and low pH, respectively. Tensile strength and hardness (Shore-D) also increased from 4 to 13.2 MPa and 35 to 52, respectively, with an increase in the acid concentration from 0 to 6;as a result of increased mixing of the two polymers.
650			_aInterpenetrating network
650			_aLatex
650			_aPolyacrylate
700			_aMittal C K
700			_aTrivedi M K
942			_cJS
999			_c62041 _d62041