000			02027nam a2200229Ia 4500
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100			_aKaenhin L
245		0	_aSynthes and characterisation of wterborne plyurethane ahesives from hdroxyl terminated ntural rbber
260			_bJournal of Rubber Research _c2012
300			_a217-229
520			_aWaterborne polyurethane adhesives weresynthesised by an isocyanate terminated polyurethane prepolymer process using 2,2-bis (hydroxymethyl) propionic acid (DMPA) as an internal emulsifier and chain extension by 1,4- diaminobutane. The different characteristics polyols such as hydroxyl terminated natural rubber (HT) with various number average molecular weight(Mn) at 600 (HT600) and 100 g/mol (HT1000) and epoxidised HT (eHT) with 10 (10eHT) and 37 (37 eHT) percentages of epoxidation were synthesised from natural rubber latex (NRL) for preparing the WPUA. Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy (H-NMR) techniwues were used to characterise the chemical structures. The pH value, mean particle size, viscosity, glass transition temperature (Tg), T-peel strength and lap shearstrength of the WPUAs were measured. The WPUAs had pH values of about 7.80 to 8.50. The mean particle size of the WPUAs depended on the DMPA content. At higher DMPA content, a smaller mean particle size was obtained. The Tg of WPUAs exhibited the same trend values of HT and eHT. T-peel strength and lap shear strenth of adhesives were measured by bonding of leather to leather. It was found that WPUA600 and WPUA1000 showed good adhesion. thus, HT and eHT prepared from NRL can be used to prepare WPUA for the footwear industry.
650			_aHydroxyl terminated natural rubber
650			_apolyurethane dispersion
650			_awaterborne polyurethane
700			_aCampistron I
700			_aKlinpituksa P
700			_aLaguerre A
700			_aPilard JF
700			_aRungvichaniwat A
700			_aSaetung A
942			_cJS
999			_c70121 _d70121