盐环境下共水解和后水解聚丙烯酰胺分子量和半径分布的表征,Journal of Applied Polymer Science

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盐环境下共水解和后水解聚丙烯酰胺分子量和半径分布的表征
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-03-03 , DOI: 10.1002/app.50616
Viralkumar Patel ₁ , Yogeshkumar Dalsania ₁ , Madhar Sahib Azad ₁ , Tushar Sharma ₂ , Japan Trivedi ₁

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在不同盐水条件下，水解聚丙烯酰胺（PAM）的结构变化显示出对流变性能的显着影响。在较高的剪切速率下，这些构象变化无法在剪切流变学领域中发现，但是拉伸流变学可以探测聚合物的微观结构，可以提供更好的描述。在本文中，在不同的盐水条件下测试了两种类型的聚合物：共水解的PAM和后水解的PAM。解释聚合物构象结果以确定聚合物和阳离子相互作用的潜在机理及其对延伸性能的影响。R _g）。但是，与阳离子相互作用后，在共水解的PAM上均匀的羧酸根离子密度限制了聚合物链的收缩，这归因于高Hencky应变下的聚合物链缠结，导致了高应变硬化。而与羧酸酯基团的单价阳离子相互作用导致维持宽MWD的单齿结构，这解释了观察到的更高的应变硬化和延伸弛豫时间。

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Characterization of co‐ and post‐hydrolyzed polyacrylamide molecular weight and radius distribution under saline environment

The structural changes in the hydrolyzed polyacrylamide (PAM) under different saline conditions show significant effects on the rheological properties. At the higher shear rates, these conformational changes cannot be discerned in the shear rheological field but the extensional rheology can probe the polymer's microstructure can provide a better description. In this paper, two types of polymers: co‐hydrolyzed PAM and post‐hydrolyzed PAM were tested under different saline conditions. The polymer conformation results were interpreted to ascertain the underlying mechanisms of polymer and cation interactions and their effect on the extensional properties. The results showed that the interactions of polymer chains with divalent cations lead to the formation of the cross‐linked chelating structures corresponded to the narrow molecular weight distribution (MWD) with a lower radius of Gyration (R_g). However, the uniform carboxylate ion density across the co‐hydrolyzed PAM restricted shrinkage of the polymer chains after interactions with cations showed the high strain hardening due to polymer chain entanglement at high Hencky strain. Whereas, monovalent cation interactions with the carboxylate groups resulted in the monodentate structures that sustained the broader MWD that explains the observed higher strain hardening and extensional relaxation time.

更新日期：2021-03-26

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