Expression mechanism of biocompatibility of polymer materials based on the state-change behavior of incorporated water molecules

利用变温红外光谱技术，在血液相容性高分子材料中掺入的水分子观察到的再结晶现象（水分子在加热过程中结晶）可归因于单体或低聚水分子的状态变化，而不是非晶态冰向结晶冰的转变，这否认了具有特定氢键网络的水分子的存在。此外，对几种不具有血液相容性的高分子材料中掺入的水分子的红外测量也表明存在再结晶现象。将玻璃化转变温度与聚合物中元素组成进行比较表明，再结晶现象与聚合物链的迁移率以及水分子与聚合物之间的静电相互作用密切相关。

Using temperature-variable infrared spectroscopy, recrystallization phenomena (crystallization of water molecules during the heating process) observed for water molecules incorporated in blood-compatible polymer materials could be ascribed to state changes of monomeric or oligomeric water molecules and not to the transition of amorphous ice to crystal ice, which denied the presence of water molecules having a specific hydrogen-bonded network. Furthermore, the infrared measurements of water molecules incorporated in several kinds of polymer materials without blood compatibility indicated the presence of recrystallization phenomena, too. Comparing the glass transition temperature with the composition of elements in the polymers indicated that the recrystallization phenomena are strongly related to the mobility of polymer chains and the electrostatic interaction between water molecules and the polymers.