尼龙6/聚酯(PET)共混体系结晶相分离的研究

用差示扫描量热（ＤＳＣ）考察尼龙６／聚酯（ＰＥＴ）共混体系的结晶行为，表明是结晶相分离的。不同条件下，结晶相分离的过程和形成的结晶态不同，反映在热行为上，如熔融过程和相应特征参数值，便随着处理的条件、组成比等而改变。研究结果还表明，当尼龙６组分的质量分数Ｗ ＰＡ－６＜ ０．１ 时，它被ＰＥＴ 阻隔而不再结晶，因两者形成部分氢键，酯基对尼龙６ 结晶影响的结果，尼龙６／聚酯（ＰＥＴ）共混体系中尼龙６ 的熔融峰温，随组成比的变化呈现波浪形曲线。

STUDY ON THE CRYSTAL PHASE SEPARATION OF NYLON 6/POLY (ETHYLENE TEREPHTHALATE) BLENDS

The crystal behavior of nylon 6/poly(ethylene terphthalate) “PA 6/PET” blends have been investigated by differential scanning calorimetry (DSC). It is shown that they display crystal phase separation. The process of crystal phase separation and the crystal state of formation are different with different condition of crystallization or treatment, for example, precipitated from solution, crystallized from glass state or melt. Therefore, their thermal behavior (as process of melt and melting peak temperature etc.) not only are changed with composition, but also are changed with condition of crystallization etc. Results are shown also that nylon 6 can not do the crystallization,if component of nylon 6 is less than 10% in PA 6/PET blends, because the crystal nucleus formation of nylon 6 are separated (or obstructed) by PET. In PA 6/PET blends, three curves of the melting peak temperature ( T m) of nylon 6 versus composition display wave form, that can be explained by formation of hydrogen bond between the nylon 6 and the PET and effect of ester group on the crystal free energy of nylon 6.