Quantitative Characterization of Photodegradation Effects of Polymeric Materials Exposed in Weathering Environments

Author(s):  
JW Martin ◽  
JA Lechner ◽  
RN Varner
Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 419-431
Author(s):  
Zahid Iqbal ◽  
Muhammad Ishaq ◽  
Adnan Aslam ◽  
Muhammad Aamir ◽  
Wei Gao

AbstractNanosheets are two-dimensional polymeric materials, which are among the most active areas of investigation of chemistry and physics. Many diverse physicochemical properties of compounds are closely related to their underlying molecular topological descriptors. Thus, topological indices are fascinating beginning points to any statistical approach for attaining quantitative structure–activity (QSAR) and quantitative structure–property (QSPR) relationship studies. Irregularity measures are generally used for quantitative characterization of the topological structure of non-regular graphs. In various applications and problems in material engineering and chemistry, it is valuable to be well-informed of the irregularity of a molecular structure. Furthermore, the estimation of the irregularity of graphs is helpful for not only QSAR/QSPR studies but also different physical and chemical properties, including boiling and melting points, enthalpy of vaporization, entropy, toxicity, and resistance. In this article, we compute the irregularity measures of graphene nanosheet, H-naphtalenic nanosheet, {\text{SiO}}_{2} nanosheet, and the nanosheet covered by {C}_{3} and {C}_{6}.


2021 ◽  
Vol 68 ◽  
pp. 135-141
Author(s):  
Tomislav Čaval ◽  
Noortje de Haan ◽  
Andriana Konstantinidi ◽  
Sergey Y Vakhrushev

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