Belyamani Imane, K Hassan Mohammad
Department of Polymer Science and Engineering, The University of Southern Mississippi, 118 College Drive #5050, Hattiesburg, MS 39406, USA.
Institut Supérieur de Plasturgie d'Alençon (ISPA), Campus d'Alençon, 61250 Damigny, France.
Polymers (Basel). 2020 May 21;12(5):1179. doi: 10.3390/polym12051179.
The present study provides a fundamental understanding of the mechanism of action of special new phosphate glass (P-glass) systems, having different glass transition temperatures (), in polyamide 66 (PA66). Dynamic mechanical analysis (DMA) revealed that the of PA66/low P-glass (ILT-1) was significantly shifted to a lower (65 °C), and another transition appeared at high temperature (166 °C). This was supported by a drop in the melting point and the crystallinity of the PA66/ILT-1 hybrid material as detected by differential scanning calorimetry (DSC). The dielectric spectroscopic investigation on the networks' molecular level structural variations ( and sub- relaxations) agreed very well with the DMA and DSC findings. Contrary to intermediate (IIT-3) and high P-glass (IHT-1) based materials, the PA66/ILT-1 hybrid material showed an evidence of splitting the PA66 relaxations into two peaks, thus confirming a strong interaction between PA66 and ILT-1 (low P-glass). Nevertheless, the three different P-glass compositions did not show any effect on the PA66 sub- relaxations (related to the -NH and -OH chain end groups' motion).
本研究对具有不同玻璃化转变温度（）的特殊新型磷酸盐玻璃（P-玻璃）体系在聚酰胺66（PA66）中的作用机制提供了基本认识。动态力学分析（DMA）表明，PA66/低玻璃化转变温度P-玻璃（ILT-1）的显著向较低温度（65℃）移动，并且在高温（166℃）出现了另一个转变。差示扫描量热法（DSC）检测到PA66/ILT-1杂化材料的熔点和结晶度下降，这支持了上述结果。对网络分子水平结构变化（和次级弛豫）的介电谱研究与DMA和DSC的结果非常吻合。与基于中间玻璃化转变温度（IIT-3）和高玻璃化转变温度P-玻璃（IHT-1）的材料相反，PA66/ILT-1杂化材料显示出将PA66的弛豫分裂为两个峰的证据，从而证实了PA66与ILT-1（低玻璃化转变温度P-玻璃）之间存在强相互作用。然而，三种不同的P-玻璃组成对PA66的次级弛豫（与-NH和-OH链端基团的运动有关）没有任何影响。
