Effect of OMMT reinforcement on morphology and rheology properties of polyurethane copolymer nanocomposites
Effect of OMMT reinforcement on morphology and rheology properties of polyurethane copolymer nanocomposites
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DOI：
10.1177/00952443211006160
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发表时间：
2021-04-20
影响因子：
1.7
通讯作者：
Saiani, Alberto
中科院分区：
文献类型：
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作者：
Albozahid, Muayad;Naji, Haneen Zuhair;Saiani, Alberto
有机改性蒙脱土颗粒（OMMT）的显著结构特征使其在提高75%硬段聚氨酯共聚物（PUC/75）的不同性能方面发挥了重要作用。基于熔体嵌入法，将不同量的OMMT加入到PUC/75溶液中，然后进行注塑工艺。需要指出的是，本工作合成的PUC/75依赖于1,5-戊二醇作为扩链剂，以成功制备出长期热稳定的PUC。研究了不同负载的OMMT对纯PUC/75及其纳米复合材料流变性能的影响。采用x射线衍射（XRD）和扫描电镜对PUC/OMMT的结构进行了研究。此外，利用差示扫描量热法（DSC）热图研究了OMMT对所得PUC纳米复合材料的热转变和结晶度的影响。有趣的是，动态流变分析显示，与纯PUC/75相比，随着OMMT载荷的增加，熔体流变行为显著增加。这可能表明OMMT表面官能团与PUC/75结构域之间存在良好的相互作用；特别是硬畴，DSC结果显示PUC/OMMT纳米复合材料的熔体温度（T-m）有适度的改善。然而，由于OMMT的聚集，结晶温度（T-c）也有所下降，特别是在较高的OMMT负载下。而XRD结果显示，相对于纯PUC/75， PUC纳米复合材料的晶峰有轻微的移动。
The remarkable structural features of organic modified montmorillonite particles (OMMT) enable them to complete their important role in enhancing different properties of polyurethane copolymer with 75 wt.% hard segments (PUC/75). Based on the melt intercalation approach, various amounts of OMMT were incorporated into PUC/75 solution followed by the injection moulding process. It is essential to mention that the synthesized PUC/75 in this work relied on using 1,5-Pentanediol as a chain extender in order to produce a long-term and thermal-stable PUC successfully. The effect of incorporating various loading of OMMT on rheological properties of neat PUC/75 and its nanocomposites was investigated. The structure of PUC/OMMT was studied using X-ray diffraction (XRD) and scanning electron microscopy. Additionally, differential scanning calorimetry (DSC) thermograms were utilized to investigate OMMT effect on the thermal transitions and crystallinity of resultant PUC nanocomposites. Interestingly, the dynamic rheological analysis exhibited a remarkable increase in melt rheology behaviour with increasing OMMT loading compared to neat PUC/75. This could imply a good interaction between the functional group on the surface of OMMT and PUC/75 domains; particularly hard domains, herein the DSC results showed moderate improvement in melt temperature (T-m) of PUC/OMMT nanocomposite. However, a decline in crystalline temperature (T-c) was also seen due to aggregation of OMMT, especially at higher OMMT loading. While XRD results exhibited a slight shifting in crystalline peaks of PUC nanocomposites relative to neat PUC/75.