Temperature and pH dual dependent conformational transition of polyacrylic acid modified by dehydroabietic alcohol
Source abstract
Abstract
Abstract A rosin derivative, dehydroabietic alcohol (DHAA), was synthetized and employed to graft onto polyacrylic acid (PAA) via the Steglich esterification reaction, forming a block copolymer consisting of the acrylic acid units and monomer units containing ester groups. The resulted dehydroabietic alcohol grafted polyacrylic acid (DHAA-graft-PAA) demonstrated enhanced pH and temperature sensitivities. The number ratio of the acrylic acid monomer units reacted with the DHAA and the un-reacted acrylic acid monomer units, was estimated by the NMR results. The number-average molecular weight of DHAA-graft-PAA was determined to be 9290 by an acid-base titration method. The optimal decomposition temperature of DHAA-graft-PAA measured using a thermogravimetric analyzer was approximately 289°C. The structural characteristics of the DHAA-PAA were analyzed using Fourier transform infrared spectroscopy, ultraviolet (UV) spectroscopy, and proton nuclear magnetic resonance spectroscopy (1HNMR). The conformational transition of the DHAA-PAA under different pH and temperature values was investigated. The scattering intensity experiments showed that 7.96 was a critical pH value and 5°C was a critical temperature. When the pH value was below 7.96, the degree of carboxyl group ionization in the polymer was decreased, leading to a repulsion between the carboxyl groups in the polymer chains and causing the chain contraction. When the temperature dropped to 5°C, the conformation transitioned from an extended state to a contracted state. This study demonstrates the intelligent applications for a novel pH and temperature sensitive polymer.
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Research context
OpenAlex topics: Advanced Polymer Synthesis and Characterization · Free Radicals and Antioxidants · Dendrimers and Hyperbranched Polymers
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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