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Application of silver phosphate as an efficient photocatalyst for pet-raft controlled polymerization

A photocatalyst, silver phosphate technology, applied in the field of photocatalysis and polymer, to achieve the effect of good time control and narrow dispersion

Active Publication Date: 2021-06-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to our knowledge, the LSPR strategy has never been used in light-regulated living radical polymerization

Method used

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  • Application of silver phosphate as an efficient photocatalyst for pet-raft controlled polymerization
  • Application of silver phosphate as an efficient photocatalyst for pet-raft controlled polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 5 mg rhombohedral dodecahedral silver phosphate, 11.2 mg BTPA, 549 μL methyl acrylate and 1 mL dimethyl sulfoxide, add them to a 10 mL quartz reaction bottle and seal them, use the bubbling method to remove the air in the reaction system, and then put the reaction bottle Into the photoreactor, at 2mW / cm 2 Under blue light irradiation, the reaction was carried out for 3.7 hours. The conversion rate was 76.5%, the theoretical molecular weight was 8560, the measured molecular weight was 10560, and the molecular weight distribution D was 1.10.

Embodiment 2

[0030] Take 5mg of tetrahedral silver phosphate, 11.2mg of BTPA, 549μL of methyl acrylate and 1mL of dimethyl sulfoxide and add them into a 10mL quartz reaction vial to seal it. Use the bubbling method to remove the air in the reaction system, and then put the reaction vial into the light. In the reactor, at 2mW / cm 2 Under blue light irradiation, the reaction was carried out for 3.7 hours. The conversion rate was 82.6%, the theoretical molecular weight was 9240, the measured molecular weight was 13120, and the molecular weight distribution D was 1.12.

Embodiment 3

[0032] Take 5mg of tetrapod-like silver phosphate, 11.2mg of BTPA, 549μL of methyl acrylate and 1mL of dimethyl sulfoxide, put them into a 10mL quartz reaction bottle and seal it, use the bubbling method to remove the air in the reaction system, and then put the reaction bottle into the light In the reactor, at 2mW / cm 2 Under blue light irradiation, the reaction was carried out for 3.7 hours. The conversion rate was 69.1%, the theoretical molecular weight was 7730, the measured molecular weight was 9200, and the molecular weight distribution D was 1.12.

[0033] figure 1 The morphology (rhombic dodecahedron, tetrahedron, tetrapod) and its ultraviolet-visible diffuse reflectance spectrum of silver phosphate adopted in the embodiments 1 to 3 are shown. The catalytic effects of silver phosphate were compared.

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Abstract

The present invention provides the application of silver phosphate as an effective photocatalyst for the controlled polymerization of PET-RAFT. According to the method provided by the present invention, a polymer with predictable molecular weight and narrow dispersion can be obtained, and it shows a good effect on the molecular weight growth process. Time control and maximum retention of polymer terminal chain fidelity can realize PET-RAFT polymerization of monomers such as MA, BA, BzA, MMA, BzMA, DEGA, and HEA, which has certain universality. In addition, the method also has a certain oxygen tolerance, taking advantage of the good permeability of NIR light, the polymerization can still proceed smoothly when a transparent or opaque barrier is placed between the light source and the reaction vessel.

Description

technical field [0001] The invention relates to the field of photocatalysis and polymers, in particular to the application of silver phosphate as an effective photocatalyst for PET-RAFT controllable polymerization under visible light and near-infrared light. Background technique [0002] Photosynthesis has inspired chemists to develop advanced photocatalysis to harvest solar energy for synthetic conversion. To improve solar energy utilization efficiency, artificial photocatalytic systems should be able to efficiently capture visible and near-infrared (NIR) photons, which account for ~95% of the solar spectrum reaching the Earth's surface. In particular, photocatalysis using long-wavelength visible light and near-infrared photons is currently a cutting-edge topic in this field and is expected to overcome the limitations of traditional ultraviolet (UV) and short-wavelength visible light-activated synthetic reactions, such as penetration in most reaction media. Low depth, espe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/14C08F120/18C08F120/28C08F2/48
CPCC08F2/48C08F120/14C08F120/18C08F120/28C08F2438/03
Inventor 蒋婧婕叶钢陈靖
Owner TSINGHUA UNIV
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