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Grafted copolymer, grafted copolymer/silver nanocomposite and preparation method thereof

A technology of graft copolymer and composite material, applied in the field of graft copolymer/silver nanocomposite material and its preparation

Active Publication Date: 2019-01-04
北京引发科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the ring-opening addition reaction of tetrahydrofuran initiated by a macromolecular initiator is combined with the "graftingonto" synthesis method to prepare polyvinyl alcohol or ethylene-vinyl alcohol copolymer as a polar backbone in situ. Isobutylene is a non-polar branched amphiphilic graft copolymer with 1 to 3 tetrahydrofuran as connecting units and its composite material with nano-silver (Ag) has not been reported yet.

Method used

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  • Grafted copolymer, grafted copolymer/silver nanocomposite and preparation method thereof
  • Grafted copolymer, grafted copolymer/silver nanocomposite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] (1) Synthesis of polyvinyl acetate

[0083] Using 100 mL of vinyl acetate (VAc) as raw material, 0.146 g of azobisisobutyronitrile as an initiator, and methanol as a solvent, a free radical polymerization reaction was carried out at a reaction temperature of 70° C. and a reaction time of 3 h. After the reaction, the solvent and unpolymerized monomers in the product were distilled off under reduced pressure to obtain polyvinyl acetate; the product polyvinyl acetate was vacuum-dried to constant weight at 40°C for subsequent use;

[0084] (2) Preparation of polyvinyl acetate of partial alcoholysis

[0085] 4g of polyvinyl acetate was completely dissolved in methanol / water (9:1, v / v) mixed solution, and hydrochloric acid was added to adjust [H + ] Concentration is 0.2mol / L, reaction time is 2h, obtains the polyvinyl acetate (PVAc-OH) of partial alcoholysis that alcoholysis degree is 9.43%, the PVAc-OH is vacuum-dried to constant weight at 40 ℃;

[0086] (3) Preparation of...

Embodiment 2

[0098] The preparation method is as in Example 1, except that in step (5), 0.26 g of polyisobutylene containing allyl bromide as a macroinitiator is used as the macroinitiator, and the amount of silver perchlorate is 0.015 g. The grafting efficiency was 100%.

[0099] The absolute weight-average molecular weight of polyvinyl alcohol and polyisobutylene graft copolymer is 160kg / mol, the mass percent content of PIB branched chain is 61%, the graft density is 1.6%, the contact angle is 48 °, and the Ag content is 0.98%, The molecular weight of the main chain is 29kg / mol, the molecular weight of the branched chain is 4500g / mol, the number of THF linking units is 2, D is 6.5mm, R is 1.18, no cytotoxicity, and the cell survival rate is 100%.

Embodiment 3

[0101] The preparation method is the same as in Example 1, except that in step (5), 0.52 g of polyisobutylene whose end group contains allyl bromide is used as a macroinitiator, and the amount of silver perchlorate is 0.03 g. The grafting efficiency was 99%.

[0102] The absolute weight-average molecular weight of polyvinyl alcohol and polyisobutylene graft copolymer is 235kg / mol, the mass percent content of PIB branched chain is 76%, the graft density is 3.1%, the contact angle is 73°, and the Ag content is 1.91%. The molecular weight of the main chain is 29kg / mol, the molecular weight of the branched chain is 4500g / mol, the number of THF linking units is 2, D is 8.0mm, R is 1.45, the cell survival rate is 82%, and the cytotoxicity is low.

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Abstract

The invention relates to the field of synthesis and preparation of high polymer materials, and provides a grafted copolymer, a grafted copolymer / silver nanocomposite and a preparation method thereof.According to the grafted copolymer, polyvinyl alcohol or an ethylene-vinyl alcohol copolymer is adopted as a main chain, and polyisobutene is adopted as a branch chain; the main chain and the branch chain are in keyed joint in a grafted mode; the absolute weight-average molecular weight of the grafted copolymer ranges from 80 kg / mol to 700 kg / mol, and on the basis that the total mass of the grafted copolymer is 100%, the mass percentage content of polyisobutene as the branch chain ranges from 15% to 95%, and the grafting density ranges from 0.2% to 19%. According to the grafted copolymer, thegrafted copolymer / silver nanocomposite and the preparation method thereof, the number of the branch chain and the molecular weight of the branch chain are effectively controlled, the water contact angle of the composite ranges from 28 degrees to 110 degrees, the hydrophily / hydrophobicity is adjustable, and the antibacterial property, the biocompatibility and cell nontoxicity are achieved.

Description

technical field [0001] The present invention relates to the field of synthesis and preparation of polymer materials, more specifically, to a graft copolymer of polyvinyl alcohol or ethylene-vinyl alcohol copolymer and polyisobutylene and graft copolymer / silver nanocomposite material and its preparation method. Background technique [0002] In recent years, as people pay more and more attention to environmental protection and health, the research and application of biomedical polymer materials have become more and more extensive. The properties of biomedical polymer materials are closely related to their structures. Therefore, it is an extremely important technology to prepare bionontoxic and biocompatible medical polymer materials with various structures. [0003] Polyisobutylene (PIB) is a non-polar synthetic polymer containing only carbon and hydrogen, which has excellent air tightness, water tightness, thermal stability, aging resistance, acid and alkali resistance, chem...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08L87/00C08K3/08
CPCC08G81/021C08K3/08C08K2003/0806C08K2201/011C08L87/005
Inventor 吴一弦刘晓张树薛晓贤
Owner 北京引发科技有限公司
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