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抄録
歯科用レジンの改良を分子構造面から検討し, 分子剛直性で耐水性を示すビスフェノールと屈曲性を有するアルコキサイド鎖を交互に主鎖に有する鎖長の異なるEpDMAを合成し, 諸物性を検討したところ, 長鎖になるほど硬さはやや低下するが, 重合収縮, 熱膨張係数および吸水率は小さく, 曲げ強さ, 屈曲性, 耐摩耗性は向上した.また, EpDMA-TEDMAコポリマーの物性を調べたところ, EpDMAの比率が多くなるにつれて, 重合収縮, 熱膨張係数, 吸水率は低下し, 曲げ強さ, 弾性率, 硬さは上昇し, 耐摩耗性はいずれのEpDMAにおいても25〜50mol%で最も良好であった.
In order to improve dental resin was synthesized EpDMA with different molecular lengths, which is alternatingly composed of rigid and water-resistant bisphenol A units and flexible alkoxide units in the main chain.Such molecular structure of EpDMA was considered to be suitable for improvement of dental resin.It was found that the longer the molecular length of EpDMA, the more favorable properties were endowed for dental use, though rather the softer it became;such properties as polymerization shrinkage, thermal expansion, water sorption, transverse strength, flexibility and abrasion resistance were improved as the molecular lengths of EpDMA increased.The copolymer of EpDMA and TEDMA was prepared at various comonomer rations.And it was found that such properties as polymerization shrinkage, thermal expansion, water sorption, transverse strength, elastic modulas and hardness were improved as the monomer ratio of EpDMA increased and that the abrasion resistance was the highest around 50mole% of EpDMA concentration.
