polycondensation reaction
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2021 ◽  
Vol 12 (2-2021) ◽  
pp. 164-168
Author(s):  
M. B. Malysheva ◽  
◽  
D. S. Bernadskaia ◽  
E. B. Roshchin ◽  
I. R. Elizarova ◽  
...  

In this paper, the effect of the silicon content in the sample solution on obtaining reliable analysis results of macro- and microcomponents of a mineral sample is shown. The methods for sample preparation and analysis are proposed. It should be noted that it is important to take into account the polycondensation reaction of silicic acids, its effect on the shelf life of the sample without the formation of polymer forms.


2021 ◽  
pp. 377-382
Author(s):  
Givi Papava ◽  
Nora Dokhturishvili ◽  
Marina Gurgenishvili ◽  
Ia Chitrekashvili ◽  
Eter Gavashelidze ◽  
...  

2021 ◽  
Author(s):  
Mateusz Gosecki ◽  
Monika Gosecka ◽  
Malgorzata Urbaniak

Polyester polyols synthesized via polycondensation reaction of diols with diacids or their diesters are commonly used as polyurethanes building blocks. Herein, we demonstrate an alternative route to polyester polyols via...


Author(s):  
Michelle Yan Chi Ting ◽  
Lars Yunker ◽  
Ian C. Chagunda ◽  
Katherine Hatlelid ◽  
Meghan Vieweg ◽  
...  

Understanding catalytic reactions is inherently difficult because not only is the catalyst the least abundant component in the mixture, but it also takes many different forms as the reaction proceeds....


RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 2756-2766
Author(s):  
Yi Zhang ◽  
Weiwei Yang

In this study, a highly effective flame retardant agent, called polybicyclopentaerythritol phosphate-O-4-imino-p-phenylmethane-4-imino-2-chloro-1,3,5-s-triazine (PEDMCD), has been prepared through a direct polycondensation reaction.


2021 ◽  
Author(s):  
TianHao Ai ◽  
Guangji Zou ◽  
Wutong Feng ◽  
Zhonglai Ren ◽  
Fei Li ◽  
...  

A series new biobased polyamide 10T-co-56 are synthesized with various comonomer composition by one-pot polycondensation reaction and investigated their structures, crystalline and melting behavior by using 1H-NMR spectroscopy, wide angle...


2021 ◽  
Author(s):  
Ting Zeng ◽  
Hongyan Miao ◽  
Likui Wang ◽  
Yun Liu ◽  
Gang Shi ◽  
...  

We demonstrate a facile and effective approach to prepare nitrogen/phosphorus co-doped porous carbon materials by means of carbonizing cyclomatrix polyphosphazene, which is synthesized by polycondensation reaction of p-phenylenediamine and hexachlorocyclotriphosphazene....


RSC Advances ◽  
2021 ◽  
Vol 11 (55) ◽  
pp. 34849-34859
Author(s):  
Yi Zhang

In this study, a flame retardant agent, called PEDSCD, is synthesized through a polycondensation reaction.


Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2395
Author(s):  
Vladimir Botvin ◽  
Svetlana Karaseva ◽  
Victor Khasanov ◽  
Anatoly Filimoshkin

For glycolic acid oligomers (GAO): l-lactic acid oligomers (LAO) mixtures, as an example, it was shown that the nature of the active sites of the catalysts significantly affect the depolymerization process. So, ZnO, which has mainly basic sites, leads to the highest yield of cyclic diesters. On the contrary, depolymerization in the presence of acidic γ-Al2O3 and without a catalyst is characterized by lower diester yields due to the prevalence of a side polycondensation reaction. Using GAO:LAO mixtures, it was shown that in the case of three studied systems (with ZnO, γ-Al2O3, and without catalyst), mixed interactions occurred, including homo-paired and hetero-paired intermolecular interactions, as well as intramolecular interactions of oligomeric molecules. Kinetic models of the processes under study were determined by isoconversional thermal analysis. In the case of depolymerization of oligomers in the presence of ZnO, the kinetic model was between the kinetic models of the first (F1) and second (F2) orders, while in depolymerization in the presence of γ-Al2O3 and without a catalyst, the process was described by diffusion models such as the Jander equation (D3) and Zhuravlev, Lesokin, Tempelman equation (D5).


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