Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 50, Pages 34744-34754Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11476
Keywords
luminescent polymer composites; carbon quantum dots; shape memory; tunable shape recovery behavior; water environments
Funding
- National Natural Science Foundation of China [51472165, 21204042]
- Fundamental Research Project of Shenzhen [JCYJ20160422102541990, JCYJ20160520160830116, JCYJ20140509172609160]
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Luminescent water-induced shape memory polymer (SMP) composites with tunable shape recovery rate are developed by blending poly(vinyl alcohol) (PVA) and carbon quantum dots (CQDs). The oxygen and active hydrogen-rich CQDs can serve as extra physical cross-linking points in PVA via strong hydrogen bonding interaction, which largely improves the shape memory performances of PVA. At room temperature, water can successfully actuate the shape recovery of deformed PVA/CQDs composite. It is demonstrated that this water-induced shape recovery is mainly attributed to the plasticizing effect of water and its competitive hydrogen bonding. Furthermore, a quantitative bending test suggests that the shape recovery time of this water-induced SMP is tunable by altering the environmental pH value and temperature, and a relatively large shape recovery time window (from 20 to 200 s) can be achieved. In addition, the introduction of CQDs endows the PVA/CQDs SMP composites with excellent luminescent property, which makes the shape change of SMP visible under UV light. It should be noted that the mild stimulus condition and tunable shape recovery performances make the luminescent visible PVA/CQDs SMP feasible for diverse biological applications in smart medical devices, stimuli-responsive drug-release, and intelligent sensors in vivo and in vitro.
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