Novel pH- and thermoresponsive supramolecular dendronized copolymer
- PDF / 2,099,515 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 100 Downloads / 182 Views
ORIGINAL RESEARCH
Novel pH‑ and thermoresponsive supramolecular dendronized copolymer Ya Qun Zou1 · Bowen Hu1 · Ling Chen1 · Tuo Ji1 · Ming Yang1 · Chang An Yang1 Received: 21 June 2020 / Accepted: 26 September 2020 © Iran Polymer and Petrochemical Institute 2020
Abstract Functional materials with stimulus response and simple control response have gained increasing attention from scientists due to the high demand for advanced materials essential for emerging technologies. The current work discusses the synthesis and characterization of novel dual-stimulus responsive supramolecular dendronized copolymers which were synthesized by different tail chain lengths stimuli responsive dendron (G1-MTEOn-CHO, n = 2, 3) with aldehyde groups and the polymer polyvinyl benzylamine hydrochloride (PVBAHS) with amino groups in the side chain through the dynamic covalent bond self-assembly. The self-assembly behaviours and stimuli-responsive properties of copolymers were also investigated by ultraviolet–visible spectrophotometry and nuclear magnetic resonance. The results revealed that the supramolecular dendronized copolymers displayed excellent thermal- and pH-responsive performance. The low critical solution temperature (LCST) of short-tailed copolymer was stable at 41 °C under alkaline conditions, while the long-tailed copolymer was stable at 53 °C. This could also be effectively regulated by adjusting the amino-to-aldehyde molar ratio for LCST of the copolymer. Moreover, it would increase with the enlargement of glycol ether tail chain length and the copolymer with long tail chain showed typical temperature sensitivity under weak acid conditions. Advantages of this dual-stimulation responsive polymer are: (1) simple and controllable regulation, (2) moderate temperature and (3) superior performance in encapsulation and release behaviour of the Nile red fluorophore. Keywords Smart materials · Stimulating responsive polymer · Self-assembly · Dynamic covalent bond · Dendronized polymer
Introduction Stimulating responsive polymers exhibit a drastic change in structure, function or stability induced by a slight environmental change [1–3]. They are a class of materials of high importance as they provide a suitable platform to tune materials properties, and also are a wonderful case for research. This ranges from tissue engineering [4, 5], information Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13726-020-00873-x) contains supplementary material, which is available to authorized users. * Ming Yang [email protected] * Chang An Yang [email protected] 1
College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, Hunan Province, PR China
processing [6, 7] and drug delivery [8–10], to name a few. Over the past few decades, stimuli-responsive polymers with the ability to respond to external or internal triggers, such as temperature [11–13], pH [14–16], light [17, 18] and redox potential [19–21], have been reported. However
Data Loading...
