Abstract
A novel pH–temperature-sensitive elastomer was made from maleate poly(vinyl alcohol)-graft-isopropylacrylamide (PVAM-graft-PNIPAM), namely PVNI and deproteinized natural rubber (DPNR) in a water-based system. The swelling ratio in water of PVNI/DPNR hydrogel enhanced as a function of PVNI portion in hydrogel due to increasing of hydrophilic group in the hydrogel. Surprisingly, the percentage of swelling in water of PVNI/DPNR hydrogel 7:3 is 24 times based on pristine DPNR. In addition, the highest tensile strength of PVNI/DPNR hydrogel was found at 7:3 PVNI/DPNR. The highest elongation at break of PVNI/DPNR hydrogel was improved after the addition of DPNR. Moreover, the resulting smart hydrogel showed a good pH–temperature sensitivity. In addition, it yielded a good polymer membrane for encapsulating capsaicin (CSC) in different media. After its use, it also easily decomposed in the natural environment.
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Acknowledgments
The authors thank the Department of Materials Science and Technology, Prince of Songkla University, The Thailand Research Fund/Prince of Songkla University/Thammasat University, for financial support (RSA5780018) and The Royal Golden Jubilee Ph.D. Program (2.L.PS/53/C.1.N.XX).
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Sukhlaaied, W., Riyajan, SA. A novel pH and temperature-sensitive maleate poly(vinyl alcohol)-graft-isopropylacrylamide/natural rubber blend: preparation and properties. Polym. Bull. 74, 803–821 (2017). https://doi.org/10.1007/s00289-016-1746-8
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DOI: https://doi.org/10.1007/s00289-016-1746-8