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Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

机译：研究各种应用聚氨酯和热塑性塑料纳米复合物的物理热机械性能

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The effect of the soft and hard polyurethane (PU) segments caused by the hydrogen link in phase-separation kinetics was studied to investigate the morphological annealing of PU and thermoplastic polyurethane (TPU). The significance of the segmented PUs is to achieve enough stability for further applications in biomedical and environmental fields. In addition, other research focuses on widening the plastic features and adjusting the PU–polyimide ratio to create elastomer of the poly(urethane-imide). Regarding TPU- and PU-nanocomposite, numerous studies investigated the incorporation of inorganic nanofillers such as carbon or clay to incorporating TPU-nanocomposite in several applications. Additionally, the complete exfoliation was observed up to 5% and 3% of TPU–clay modified with 12 amino lauric acid and benzidine, respectively. PU-nanocomposite of 5 wt.% Cloisite®30B showed an increase in modulus and tensile strength by 110% and 160%, respectively. However, the nanocomposite PU-0.5 wt.% Carbone Nanotubes (CNTs) show an increase in the tensile modulus by 30% to 90% for blown and flat films, respectively. Coating PU influences stress-strain behavior because of the interaction between the soft segment and physical crosslinkers. The thermophysical properties of the TPU matrix have shown two glass transition temperatures (Tg’s) corresponding to the soft and the hard segment. Adding a small amount of tethered clay shifts Tg for both segments by 44 °C and 13 °C, respectively, while adding clay from 1 to 5 wt.% results in increasing the thermal stability of TPU composite from 12 to 34 °C, respectively. The differential scanning calorimetry (DSC) was used to investigate the phase structure of PU dispersion, showing an increase in thermal stability, solubility, and flexibility. Regarding the electrical properties, the maximum piezoresistivity (10 S/m) of 7.4 wt.% MWCNT was enhanced by 92.92%. The chemical structure of the PU–CNT composite has shown a degree of agglomeration under disruption of the sp2 carbon structure. However, with extended graphene loading to 5.7 wt.%, piezoresistivity could hit 10−1 S/m, less than 100 times that of PU. In addition to electrical properties, the acoustic behavior of MWCNT (0.35 wt.%)/SiO2 (0.2 wt.%)/PU has shown sound absorption of 80 dB compared to the PU foam sample. Other nanofillers, such as SiO2, TiO2, ZnO, Al2O3, were studied showing an improvement in the thermal stability of the polymer and enhancing scratch and abrasion resistance.
机译：研究了由相分离动力学中的氢联连杆引起的软和硬质聚氨酯（PU）段的效果，研究了PU和热塑性聚氨酯（TPU）的形态退火。分段脓液的意义是在生物医学和环境领域的进一步应用中获得足够的稳定性。此外，其他研究侧重于加宽塑料特征和调节PU-聚酰亚胺比以产生聚（氨基甲酸酯 - 酰亚胺）的弹性体。关于TPU和PU-纳米复合材料，许多研究研究了掺入无机纳米填料，例如碳或粘土，以在几种应用中掺入TPU-纳米复合物。另外，分别观察到完全的剥离，分别观察到含有12个氨基香酸和苯并萘的TPU-粘土的5％和3％。 PU-纳米复合材料5重量％。％Cloisite®30b分别增加210％和160％的模量和拉伸强度。然而，纳米复合材料PU-0.5重量％。％碳酮纳米管（CNT）分别显示拉出和扁平膜的拉伸模量增加30％至90％。由于软链段和物理交联剂之间的相互作用，涂布PU会影响应力 - 应变行为。 TPU基质的热物理性质已经示出了与软和硬区段对应的两个玻璃化转变温度（Tg）。将少量束缚粘土分别在44℃和13℃下分别换档Tg，同时将粘土加入1至5重量％。％导致TPU复合材料的热稳定性分别从12到34°C增加。使用差分扫描量热法（DSC）来研究PU分散的相结构，显示出热稳定性，溶解度和柔韧性的增加。关于电性能，最大压阻性（10 s / m）为7.4重量％。％MWCNT增强92.92％。 PU-CNT复合物的化学结构在SP2碳结构中断的破坏下显示了一定程度的附聚度。然而，随着延长的石墨烯加载至5.7重量％。％，压阻率可能达到10-1 s / m，小于PU的100倍。除电性能外，与PU泡沫样品相比，MWCNT（0.35重量％）/ SiO 2（0.2重量％）/ PU的声学行为显示出80dB的吸声。研究了其他纳米填料，例如SiO 2，TiO 2，ZnO，Al 2 O 3，显示出聚合物的热稳定性和增强划痕和耐磨性的改善。

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