多元醇固—固相变机理的研究

多元醇在一定温度下发生固—固相变,大量文献都报道了它们的固—固相变焓、相变温度以及相图,并认为相变焓与氢键有关.本文以IR 光谱测试结果以及量热实验结果为基础,定量探讨了NPG(neopentylglycol),PG(pentaglycerino),PE(pentaerythritol)的固—固相变焓与氢键的关系,进一步解释了相变的机理:NPG,PG,PE分子在发生固—固相变前,—OH形成分子间氢键,分子具有层状结构.相变后,NPG,PG,PE分子沿着层面移动,移动过程中部分氢键断裂,分子发生相变时所吸收 关键词： 固—固相变 相变焓 氢键 红外光谱

Mechanism of polyalcohol solid-solid phase change

Many polyalcohols will change from one crystal structure to another at certain temperatures. A lot of works had reported their phase change enthalpy,phase change temperature and phase diagram. It is taken that their phase change enthalpy must be related to their hydrogen bond. This article investigated quantitatively the relation between phase change enthalpy and hydrogen bond of NPG ( neopentylglycol),PG ( pentaglycerino) and PE ( pentaerythritol) on the basis of infrared spectrum experimental data and cal...