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首页> 外文期刊>Crystal growth & design >Investigation of the Crystallization and Melting of the Tripalmitin/Triolein System via Hot Stage Microscopy, Differential Scanning Calorimetry, and Pulsed NMR
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Investigation of the Crystallization and Melting of the Tripalmitin/Triolein System via Hot Stage Microscopy, Differential Scanning Calorimetry, and Pulsed NMR

机译：通过热阶段显微镜，差分扫描量热法和脉冲NMR的三蛋白/三林系统结晶和熔化的研究

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摘要

The isothermal crystallization kinetics and melting behavior of mixtures of tripalmitin (PPP) and trioleio (OOO) were investigated' using hot stage microscopy (HSM), with supporting differential scanning caloritnetry (DSC) and NMR measurements. Some melting points determined via HSM and DSC were higher than predicted by the Hildebrand equation, but solid fat content melting profiles from NMR were dose to ideal predictions. The observed deviations from ideal behavior with HSM/DSC could be attributed to concentration gradients in the liquid phase, rather than from nonideality. Sufficient time should therefore be allowed in melting experiments for diffusional equilibration to occur the remelting time should generally be longer than the crystallization time. When crystallizing mixed PPP/OOO samples, two distinct polymorphs could be seen in the same "crystal", With an outer ring of beta' surrounding an:inner circle of beta. Polymorphic transformation from beta' to beta could be seen to occur-via dissolution through a narrow liquid interface region between the two crystals. Growth rate data for were proportional-to the reduced saturation (or supercooling) calculated assuming' deal behavior. Growth rates of beta via the solvent/melt mediated:transformation of the beta' form could be related to driving forces based on the difference in solubility of the beta' and beta forms.
机译：研究了三级素（PPP）和三脲（OOO）混合物的等温结晶动力学和熔化行为，采用热阶段显微镜（HSM），具有支撑差示扫描热量（DSC）和NMR测量。通过HINDEBRAND方程测定的一些熔点高于HILDEBRAND方程预测，但是从NMR的固体脂肪含量熔化型剂量为理想的预测。观察到与HSM / DSC的理想行为的观察到偏差可归因于液相中的浓度梯度，而不是来自非前进性。因此，应允许足够的时间在熔化实验中进行漫射平衡，以发生重熔时间通常应长于结晶时间。结晶混合PPP / OOO样品时，可以在相同的“晶体”中看到两个不同的多晶型物，围绕β的外圈：β的内圈。可以通过两个晶体之间的窄液界面区域来观察到从β'到β的多态性转化。对于假设“交易行为”计算的增长率数据对降低的饱和度（或过冷）。通过溶剂/熔体介导的β的生长率：β形式的转化可能与基于β'和β形成的溶解度差异的驱动力有关。

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