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采用热重分析对作为耐高温材料使用的聚砜酰胺基单聚合物复合材料(PSA SPCs)进行热性能研究。通过计算积分程序分解温度(IPDT)和温度指数Ts分别评价材料的热稳定性和长期使用温度,通过计算温度指数Tzg来表征耐热性能。PSA SPCs的IPDT、Ts以及Tzg分别为1305℃,248℃和255℃,而PSA树脂材料相对应的参数值依次是1162℃,243℃和244℃,表明PSA SPCs的热性能优于PSA树脂材料。采用不同升温速率,分别用Flynn-Wall-Ozawa法和Kissenger法研究其热降解动力学,计算得到反应活化能(Ea)分别为152.26 k J/mol,146.85 k J/mol,优于PSA树脂材料的Ea值(133.54 k J/mol,127.88 k J/mol)。 相似文献
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Three-dimensional porous paper was prepared by using polysulfonamide (PSA) fiber and pulp as the raw materials. The effect of PSA fiber to pulp ratios on the mechanical strength and adsorption properties (using methyl orange and rhodamine B dyes in their aqueous phase) of the paper were studied. The results showed that the tensile strength and elongation characteristics decreased as the PSA fiber to pulp ratio increased, while the tear strength increased. PSA paper showed good adsorption performance for both methyl orange and rhodamine B, with the adsorption process conforming to the pseudo-second-order and Langmuir isotherm models, indicating monolayer chemical adsorption. The study has provided an improved theoretical and scientific basis for the further development and application of PSA paper. 相似文献
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芳砜纶应用于消防防护服的性能研究 总被引:5,自引:3,他引:2
验证了芳砜纶的热稳定性及隔热性能,实验表明芳砜纶纤维经300℃以下高温长时间处理,仍能保持原纤维3/4的拉伸断裂强度;芳砜纶有不亚于Nomex的隔热性能,以此推测芳砜纶在消防防护服中有很好的应用前景. 相似文献
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Polysulfonamide (PSA)-based membranes are widely used for high-temperature filtration. PSA/polyurethane (TPU) composite membranes that can withstand a temperature exceeding 200 °C are fabricated by an electrospinning method. The effects of PSA/TPU mass ratio on the morphology and properties of the prepared composite membranes are investigated to obtain nanofibers with different diameters. These composite membranes are characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and differential scanning calorimetry, and mechanical and filtration properties of membranes are also investigated. The maximum stress and elongation at break of PSA/TPU nanofibers’ membranes reach 13.66 ±1.43 MPa and 75.01 ± 3.78%, respectively, when the PSA/TPU mass ratio is 3:7. Moreover, filtration results show high filtration efficiency (>99%) and low pressure drop for diethyl-hexyl-sebacat (DEHS) and sodium chloride (NaCl) aerosol particles at 4 m3 h−1 airflow velocity. Therefore, PSA/TPU composite membranes are a promising candidate for high-temperature filtration applications. 相似文献
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Structure and property development of aromatic copolysulfonamide fibers during wet spinning process 下载免费PDF全文
The structure and performance changes of aromatic copolysulfonamide (co‐PSA) fibers that occurred during wet spinning process have been studied. While using different length scale characterization, including scan electron microscopy (SEM), wide‐angle X‐ray scattering (WAXS), and small‐angle X‐ray scattering (SAXS), it was found that the molecular chains of co‐PSA formed an isotropic network during coagulation which further lead to extension and orientation of these chains during the subsequent stretching. As a result, only after heat stretching and heat setting the molecular chains tended to pack into crystal lattice in the fibrils. This gave rise to a much denser structure along the spinning line and the glass transition temperature of co‐PSA fibers increased a little after heat setting. Before heat stretching, the co‐PSA fibers were in amorphous state, and only the amorphous orientation was observed within the fibers. After heat stretching at the temperature higher than Tg, the fraction of amorphous region decreased, and the crystal structure formed in the fibers, which became more perfect during heat setting. The structure development during spinning process contributed toward the improvement of thermo‐mechanical stability, tenacity and modulus of the co‐PSA fibers. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42343. 相似文献