و فازگسسته پلي (آكريليك اسيد) شبكه اي شده RTV بررسي اثر مقدار هيدروژل بر خواص كامپوزيت ساخته شده بر پايه ماتريس لاستيك سيليكون

Effect of Hydrogel Content on Properties of a Composite Based on RTV Silicone Rubber on Matrix and Cross -linked Poly(acrylic acid) Particles as The Dispersed Phase

Hydrophilicity at room temperature for vulcanized silicone rubber (RTV) was characterized prior and after addition of different ratios of polyiacryiic acid). PA AC. hvdrogcf It was found that there is a direct linear relationship between equilibrium water content and the amount of hydrogel present in the matrix. Also a noticeable dicrease in contact angle was observed with increase in hydrogel content which confirms the hydrophilic character of the composite material The degree of water uptake was found to have a direct and linear relationship with the hydrogcrs degree of cross linking although this effect has not been very obvious. However, it may be assumed that the amount of hydrogel in the matrix is the determinant factor of lndrophilicity rather than that of cross linking agent in PAAC. Considering two different particle sizes for PAAC panicles it is noticed that the equilibrium water uptake with particles less than 120(Gama) is higher than the particles sizes under 250 (Gama) Therefore, the particlesʹ sizes within these given ranges cannot be considered an important factor in equilibrium water uptake But this characteristic effect of surface irregularities on blood compatibility is not ignorable. Finally, observation of unpredictable variations in contact angle values, and in particulars, surface tension. With respect to composite surfaces confirm the conjecture that interaction of the ionic PAAC hydrogel with aqueous medium, as manifested by surface tension in this study, was a function of hydrogel particle distribution in the matrix.