并用非极性溶剂或弱极性溶剂进行重结晶。
The product was recrystallized by non-polar or low-polar solvent.
第三种方法包括：1将含极性取代基的染料分子合成；2控制染料分子的聚合或结晶过程。
The third approach involves: 1 the synthesis of certain molecules containing readily polarised groups of substituents, and 2 the controlled polymerisation or crystallisation of these molecules.
这是由于纤维在化学上不活泼，表面能低，表面缺乏极性基团，且是高度对称的亚甲基结构，使得纤维具有很高的结晶度和取向度。
Because the fiber is of chemical inertion, low surface energy, lack of polar groups, and highly symmetric methylene structure, the fiber has a high degree of crystallinity and orientation.
XRD和TEM分析表明，随着溶剂介电常数和极性增加， 所生成产物的物相纯度、结晶度增高，晶粒尺寸增大。
XRD and TEM analyses show that the phase purity, crystallization and particle sizes of synthesized powders increase with the increase of the dielectric constant and polarity of the solvent.
然而聚丙烯塑料本身极性低，结晶化程度高，要形成具有良好附着力的涂层相当困难。
A one coat paint based on this modified resin has been formulated, which shows good comprehensive properties and find applications for PP plastic parts in cars, etc.
然而聚丙烯塑料本身极性低，结晶化程度高，要形成具有良好附着力的涂层相当困难。
A one coat paint based on this modified resin has been formulated, which shows good comprehensive properties and find applications for PP plastic parts in cars, etc.
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