Investigation of the Effect of Diisocyanate on the Thermal Degradation Behavior and Degradation Kinetics of Polyether-Based Polyurethanes

2020 ◽  
Vol 59 (12) ◽  
pp. 775-795
Author(s):  
Arjun Singh ◽  
Rajesh Kumar ◽  
Pramod Kumar Soni ◽  
Vasundhara Singh
Keyword(s):  
Thermal Degradation ◽  
Degradation Kinetics ◽  
Degradation Behavior ◽  
Thermal Degradation Behavior ◽  
Kinetics Of

Thermal degradation behavior and kinetics of polybenzoxazine based on bisphenol-S and aniline

2011 ◽  
Vol 523 (1-2) ◽  
pp. 170-175 ◽  
Author(s):  
Yanfang Liu ◽  
Zaiqin Yue ◽  
Zhihong Li ◽  
Zhao Liu
Keyword(s):  
Thermal Degradation ◽  
Degradation Behavior ◽  
Bisphenol S ◽  
Thermal Degradation Behavior ◽  
Kinetics Of

Thermal Degradation Behavior and Kinetics of Polybenzoxazine Based on Bisphenol-S and Allylamine

2016 ◽  
Vol 55 (4) ◽  
pp. 361-371
Author(s):  
Jinbai Huang ◽  
Hu Yue ◽  
Shufang Lv ◽  
Zhanzhan Hao ◽  
Man Wang ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Degradation Behavior ◽  
Bisphenol S ◽  
Thermal Degradation Behavior ◽  
Kinetics Of

scholarly journals Thermal degradation process of polysulfone aramid fiber

2014 ◽  
Vol 18 (5) ◽  
pp. 1637-1641 ◽  
Author(s):  
Fang-Long Zhu ◽  
Qian-Qian Feng ◽  
Qun Xin ◽  
Yu Zhou
Keyword(s):  
Thermal Degradation ◽  
Degradation Process ◽  
Aramid Fiber ◽  
Degradation Behavior ◽  
Heating Rates ◽  
Degradation Temperature ◽  
Mass Losses ◽  
Thermal Degradation Behavior ◽  
Thermal Degradation Process ◽  
Kinetics Of

Polysulfone aramid fiber is one kind of high temperature fibers. In the paper, thermal degradation behavior and kinetics of polysulfone aramid fiber were investigated by thermogravimetric analysis and differential thermogravimetric at different heating rates under nitrogen and air, respectively. The experimental results show that its initial degradation temperature is 375?C in nitrogen and 410?C in air at heating rate of 10 K/min. When temperature went to 800?C, the fiber loses all mass in air. The mass losses in the stage showed that degradation of polysulfone aramid occurs in two-step process as could be concluded by the presence of two distinct exothermic peaks in differential thermogravimetric curves.

Thermal Degradation Behavior and Kinetics of 3D Porous Polycarbonate Monoliths

2019 ◽  
Vol 304 (4) ◽  
pp. 1800667 ◽  
Author(s):  
Yuezhan Feng ◽  
Zhaoyang Li ◽  
Yingke Wang ◽  
Weiwei Chen ◽  
Bo Wang ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Degradation Behavior ◽  
Thermal Degradation Behavior ◽  
Kinetics Of

Thermal degradation kinetics of PP/PLA nanocomposite blends

2018 ◽  
Vol 32 (12) ◽  
pp. 1714-1730 ◽  
Author(s):  
Dev K Mandal ◽  
Haripada Bhunia ◽  
Pramod K Bajpai
Keyword(s):  
Thermal Degradation ◽  
Degradation Kinetics ◽  
Frequency Factor ◽  
Nitrogen Atmosphere ◽  
Thermal Degradation Kinetics ◽  
Heating Rates ◽  
Degradation Kinetic ◽  
Thermal Degradation Behavior ◽  
Kinetics Of ◽  
Thermal Stability Of

In this article, the effect of adding polylactide (PLA) and nanoclay on the thermal stability of polypropylene (PP) films was analyzed using thermogravimetric analysis. The thermal degradation kinetic parameters such as activation energy ( Ea), order of reaction ( n), and frequency factor (ln ( Z)) of the samples were studied over a temperature range of 30–550°C. Analyses were performed under nitrogen atmosphere with four different heating rates (i.e. 5, 10, 15, and 20°C min−1). The Ea was calculated by Kissinger, Kim–Park, and Flynn–Wall methods. The Ea value of PP was much higher than PLA, whereas the addition of PLA and nanoclay in PP decreased the Ea. The addition of compatibilizer increased the compatibility and Ea of blended films upto some extent. The lifetime of PP was found to be decreased with the addition of PLA and nanoclay. Studies indicated that the thermal degradation behavior and lifetime of the investigated samples depend on the fractions of constituents and heating rates.

scholarly journals Thermal Degradation Behavior and Kinetics of aged TNT-based Melt Cast Composition B

2019 ◽  
Vol 16 (3) ◽  
pp. 360-379 ◽  
Author(s):  
Arjun Singh ◽  
Tirupati Sharma ◽  
Vasundhara Singh ◽  
Niladri Mukherjee
Keyword(s):  
Thermal Degradation ◽  
Degradation Behavior ◽  
Thermal Degradation Behavior ◽  
Kinetics Of

scholarly journals Thermal Degradation Kinetics and Modeling Study of Ultra High Molecular Weight Polyethylene (UHMWP)/Graphene Nanocomposite

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1597
Author(s):  
Iman Jafari ◽  
Mohamadreza Shakiba ◽  
Fatemeh Khosravi ◽  
Seeram Ramakrishna ◽  
Ehsan Abasi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Thermal Degradation ◽  
High Molecular Weight ◽  
Degradation Kinetics ◽  
Graphene Nanosheets ◽  
Thermal Degradation Kinetics ◽  
Graphene Nanocomposites ◽  
Kinetics Of ◽  
Ultra High Molecular Weight

The incorporation of nanofillers such as graphene into polymers has shown significant improvements in mechanical characteristics, thermal stability, and conductivity of resulting polymeric nanocomposites. To this aim, the influence of incorporation of graphene nanosheets into ultra-high molecular weight polyethylene (UHMWPE) on the thermal behavior and degradation kinetics of UHMWPE/graphene nanocomposites was investigated. Scanning electron microscopy (SEM) analysis revealed that graphene nanosheets were uniformly spread throughout the UHMWPE’s molecular chains. X-Ray Diffraction (XRD) data posited that the morphology of dispersed graphene sheets in UHMWPE was exfoliated. Non-isothermal differential scanning calorimetry (DSC) studies identified a more pronounced increase in melting temperatures and latent heat of fusions in nanocomposites compared to UHMWPE at lower concentrations of graphene. Thermogravimetric analysis (TGA) and derivative thermogravimetric (DTG) revealed that UHMWPE’s thermal stability has been improved via incorporating graphene nanosheets. Further, degradation kinetics of neat polymer and nanocomposites have been modeled using equations such as Friedman, Ozawa–Flynn–Wall (OFW), Kissinger, and Augis and Bennett’s. The "Model-Fitting Method” showed that the auto-catalytic nth-order mechanism provided a highly consistent and appropriate fit to describe the degradation mechanism of UHMWPE and its graphene nanocomposites. In addition, the calculated activation energy (Ea) of thermal degradation was enhanced by an increase in graphene concentration up to 2.1 wt.%, followed by a decrease in higher graphene content.

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