Abstract：
:This study examined the effects of copolymer hydrophilicity and temperature on water sorption and solubility characteristics of five copolymer blends of increasing degree of hydrophilicity using gravimetric measurements. Six resin disks (15 mm in diameter x 1 mm in thickness) were prepared from each copolymer blend and were stored in deionised water at 23, 37 and 55 degrees C. Water sorption and solubility of the resin disks were measured before and after water immersion and desiccation. Multiple regression analysis of water sorption was performed on two independent variables, copolymer hydrophilicity and temperature. Maximum water sorption increased significantly with Hoy's total cohesive energy density (delta(t)), Hoy's solubility parameter for polar forces (delta(p)) and hydrogen bonding (delta(h)), but was not influenced by temperature. However, a significant positive relationship was observed between diffusion coefficients (obtained using Fick's law of diffusion) and temperature. The water absorption activation energy was 10 kJ/mol for the most hydrophilic copolymer blend R5 and 35-51 kJ/mol for copolymer blends R1-R4. The positive relationship between maximum water uptake and copolymer hydrophilicity suggests that water molecules diffuse through the polymer matrices by binding successively to the polar sites via hydrogen bonding. Such water sorption may determine the durability of resin-dentine bonds.
journal_name
Biomaterialsjournal_title
Biomaterialsauthors
Yiu CK,King NM,Carrilho MR,Sauro S,Rueggeberg FA,Prati C,Carvalho RM,Pashley DH,Tay FRdoi
10.1016/j.biomaterials.2005.09.037keywords:
subject
Has Abstractpub_date
2006-03-01 00:00:00pages
1695-703issue
9eissn
0142-9612issn
1878-5905pii
S0142-9612(05)00883-5journal_volume
27pub_type
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