食品聚合物科学认为：在玻璃态下，造成食品品质变化的一切受扩散控制的反应，其速率均十分缓慢，甚至不会发生。
The food polymer science demonstrates that under the glass state, the change of food quality is controlled by the reaction of diffusion, which is quite slow in speed or even could not happen.
试验结果表明，纯氧化物的氯化过程受化学反应控制，钛铁矿氯化受灰层扩散控制。
It was resulted that the chlorination process of simple oxide is under chemical reaction control, while that of ilmenite is dependent on the ash layer diffusion.
但对邻二甲苯异构化反应，由于反应不是单纯由反应产物扩散控制，它们的对位选择性并无明显改善。
For isomerization of o-xylene the improvement in para-selectivity has not been observed, because the reaction is not mainly controlled by the diffusion of the reaction products.
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