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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Expanding Monomers ： ウィキペディア英語版 Expanding Monomers Expanding Monomers are monomers which are increasing in volume (expanding) during polymerization. They can be added to monomer formulations to counteract the usual volumen shrinking (during polymerization) to manufacture products with higher quality and durability. Volume Shrinkage is in first line for the unmeltable thermosets a problem, since those are of fixed shape after polymerization completed. == Background == The quality of thermosets (crosslinked polymers) is determined by a numerous factors such as the purity of the used monomer, polymerization time and temperature, stoichiometry of comonomers (when used) or type and quantity of catalyst or initiator. Another rarely minded factor is the volume shrinking (and density increase) during polymerization; actually all polymers are shrinking during polymerization to some degree. This volume shrinkage can lead (after the gel point) to mechanical stress within the polymer (internal stress), which may cause microfractures, worse mechanical properties or detaching form the substrate. Expandable monomers occupy after polymerization a greater volume than before and were designed to counteract the volumetric shrinkage upon addition. For other applications, like precision castings or dental fillings, a slight expansion during polymerization would be desirable for complete filling of a given mold. Nonetheless, for some applications even a small shrinkage can be desirable as for one-piece molds, to accomplish an easy removal. Expanding monomers are used to influence respectively control the volume change during the polymerization.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Expanding Monomers」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.