Methylene blue sensitizer and its application in photo-Fenton-induced raft reaction
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A technology of methylene blue and polymerization reaction, applied in the field of polymer materials, can solve difficult problems such as high efficiency and safety, and achieve the effects of easy acquisition, good time control, and low price
Active Publication Date: 2022-08-02
SHENZHEN UNIV
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[0004] The purpose of this application is to provide a methylene blue photosensitizer and its application in photo-Fenton-induced reversible addition-fragmentation chain transfer polymerization, aiming to solve the difficulty of existing RAFT photosensitizers to meet high efficiency and safety at the same time The problem
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Embodiment 1
[0044] A kind of polymer 1, its preparation comprises the steps: take 1.6mg methylene blue, 13.1mg CPADB, 17uL H 2 O 2 , 1 mL of methyl methacrylate and 1 mL of DMSO were added to a test tube with a capacity of 5 mL (no need to seal), after which the test tube was placed in a photoreactor, and the reaction was carried out under the irradiation of red light for 0.5 h in frozen methanol. Purification 3 times gave polymer 1.
[0045] The conversion rate was 14% (the percentage of monomers converted to the starting monomers), the molecular weight of the polymer measured by gel permeation chromatography (GPC) was 5290, and the polymer dispersibility index (PDI) was 1.23.
Embodiment 2
[0047] A kind of polymer 2, its preparation comprises the steps: take 1.6mg methylene blue, 13.1mg CPADB, 17uL H 2 O 2 , 1mL methyl methacrylate and 1mL DMSO were added to a test tube with a capacity of 5mL (no need to seal), then the test tube was placed in a photoreactor, irradiated with red light for 1 hour, and purified 3 times in frozen methanol to obtain a polymerization thing 2.
[0048] The conversion rate was 35%, the molecular weight of the polymer measured by GPC was 8933, and the molecular weight distribution PDI was 1.24.
Embodiment 3
[0050] A kind of polymer 3, its preparation comprises the steps: take 1.6mg methylene blue, 13.1mg CPADB, 17uL H 2 O 2 , 1 mL of methyl methacrylate and 1 mL of DMSO were added to a test tube with a capacity of 5 mL (no need to seal), then the test tube was placed in a photoreactor, irradiated with red light for 2 hours, and purified 3 times in frozen methanol to obtain polymerization. item 3.
[0051] The conversion rate was 95%, the molecular weight of the polymer measured by GPC was 11511, and the molecular weight distribution PDI was 1.82.
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Abstract
The application belongs to the technical field of polymer materials, and in particular relates to the application of methylene blue as a photosensitizer in photo-Fenton initiating reversible addition-fragmentation chain transfer polymerization. In the present application, methylene blue is used as a photosensitizer in the photo-Fenton-initiated reversible addition-fragmentation chain transfer polymerization reaction, which can initiate the polymerization of various monomers, and the molecular weight of the polymer obtained after the photo-initiated system reaction is consistent with the theoretical molecular weight, The molecular weight distribution is small, and the photoinitiator system has good oxygen resistance, and the polymerization reaction does not change significantly in aerobic and anaerobic environments. It can initiate monomer polymerization under aerobic conditions without prior deoxidation, which simplifies Reaction process flow. Moreover, methylene blue is easy to obtain, non-toxic, and inexpensive, thus providing a better application prospect for the biomedical and industrial applications of the photo-Fenton-initiated reversible addition-fragmentation chain transfer polymerization system.
Description
technical field [0001] The application belongs to the technical field of polymer materials, and in particular relates to a methylene blue light sensitizer and its application in photo-Fenton-induced reversible addition-fragmentation chain transfer polymerization. Background technique [0002] Reversible deactivating radical polymerization (RDRP) includes atom transfer radical polymerization (ATRP), nitroxide mediated polymerization (NMP), and reversible addition-fragmentation chain transfer polymerization (RAFT). Among them, the RAFT polymerization reaction is very similar to the ordinary free radical polymerization reaction in the initiation stage, both of which require the introduction of free radicals in the polymerization system. RAFT polymerization can effectively establish a dynamic balance between active growing free radicals and dormant species by introducing a chain transfer agent (CTA) into the traditional free radical polymerization system, so that the polymer cha...
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