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The dynamic viscoelasticity and water absorption characteristics of soft acrylic resin materials containing adipates and a maleate plasticizer.

Dental materials journal (2012-01-27)
Guang Hong, Hiroki Tsuka, Takeshi Maeda, Yasumasa Akagawa, Keiichi Sasaki
ABSTRACT

The purpose of this study was to investigate the use of different plasticizers in soft acrylic resin materials to reduce leaching of the plasticizer and thus increase the durability of tissue conditioners. Samples were prepared containing different combinations of three types of polymer/copolymer powder and four types of plasticizer liquid (DEHM, DIBA, DAA and DINA). The dynamic viscoelasticity of each sample was measured after water immersion using a dynamic mechanical analyzer. Water absorption, solubility and weight change were also measured. A significant difference was found among the materials regarding dynamic viscoelasticity, water absorption and solubility. The samples containing P-n-BMA had the most stable G' and G'' scores throughout the immersion. P-n-BMA is the most suitable powder together with DEHM as the most suitable liquid component for a tissue conditioner. These results suggest that it is possible to improve the durability of tissue conditioners by combining different polymers and plasticizers.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Maleic acid sodium salt, ~99%
Supelco
Poly(butyl methacrylate), analytical standard, for GPC, 800,000
Sigma-Aldrich
Maleic acid, ReagentPlus®, ≥99% (HPLC)
Supelco
Maleic acid, Standard for quantitative NMR, TraceCERT®
Sigma-Aldrich
Poly(butyl methacrylate), inherent viscosity 0.470-0.560 dL/g 
Sigma-Aldrich
Sodium maleate dibasic, purum p.a., anhydrous, ≥98.0% (NT)
Sigma-Aldrich
Adipic acid, BioXtra, ≥99.5% (HPLC)
Sigma-Aldrich
Poly(ethyl methacrylate), average Mw ~515,000 by GPC, powder
Supelco
Adipic acid, certified reference material, TraceCERT®
Sigma-Aldrich
Adipic acid, 99%
Supelco
Poly(ethyl methacrylate), analytical standard, average Mw 340,000 (Typical), average Mn 126,000 (Typical)
Sigma-Aldrich
Adipic acid, ≥99.5%