Asian Journal of Applied Chemistry Research <p style="text-align: justify;"><strong>Asian Journal of Applied Chemistry Research (ISSN: 2582-0273)</strong>&nbsp;aims to publish high-quality papers (<a href="/index.php/AJACR/general-guideline-for-authors">Click here for Types of paper</a>) in all areas of 'chemistry and its application'. The journal also encourages the submission of useful reports of negative results. This is a quality controlled,&nbsp;OPEN&nbsp;peer-reviewed, open access INTERNATIONAL journal.</p> Asian Journal of Applied Chemistry Research en-US Asian Journal of Applied Chemistry Research 2582-0273 Synthesis and Characterization of Epoxy Resins-Modified Waterborne Polyurethane Emulsion <p>Aqueous polyurethane emulsion was prepared with diphenylmethane diisocyanate (MDI), polybutylene adipate diol (PBA-1000) as main raw materials and 2, 2-dihydroxymethyl propionic acid (DMPA) as hydrophilic chain extender. On this basis, epoxy resin E-44 was introduced to modify the polyurethane prepolymer, and epoxy resin modified waterborne polyurethane emulsion was obtained. In order to obtain better performance waterborne polyurethane, the effect of DMPA content、the amount of epoxy resin added and modification method on the properties of polyurethane was discussed. The results show that when the DMPA content is 4wt%, the overall performance of the emulsion and the film is the best. And the addition of epoxy resin significantly improves the water resistance, solvent resistance and tensile strength of the waterborne polyurethane film, and its hardness and thermal stability are also improved to a certain extent. When the amount of epoxy resin added is 8wt%, the storage stability decreases significantly, the suitable amount of epoxy resin added is 6wt%. The overall performance of the film obtained by chemical modification is better than that of physical modification.</p> Chenhan Zhuang Weilan Xue Zuoxiang Zeng ##submission.copyrightStatement## 2021-08-31 2021-08-31 1 9 10.9734/ajacr/2021/v9i330213 Ab initio Study of Diels-Alder Reaction between Cyclic Dienes and Olefin <p>Theoretical modeling of organic synthesis is a powerful tool and leads to further insight into chemical systems. Computational chemistry allows obtaining the potential energy surface that experimentally cannot be observed, in addition to transition state calculations, which lead to better understanding the reactivity of an organic synthesis work. The Diels-Alder (DA) reaction of cyclopentadiene <strong>1</strong> and N-phenylmaleimide <strong>2</strong> has been studied at the MP2/6-311++G(d,p) level of theory. This DA reaction occurs through a one-step mechanism. It was expected that this reaction undergoes two regio-isomeric reaction paths passing through two different transition states to form two different products <strong>3</strong>&nbsp; and <strong>4</strong>. The reaction paths are irreversible due to the exothermic character of -41.24 and -41.73 kcal.mol<sup>-1.</sup> This DA reaction are exergonic with reactions Gibbs free energies between -27.26 and -27.74 kcal⋅mol<sup>−1</sup>. Analysis of the CDFT indices predict the global electronic flux from the strong nucleophilic cyclopentadiene <strong>1</strong> to the electrophilic N-phenylmaleimide <strong>2</strong>.</p> Haydar A. Mohammad-Salim ##submission.copyrightStatement## 2021-09-02 2021-09-02 10 17 10.9734/ajacr/2021/v9i330214