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Ternary double-grafted amphiphilic copolymer and preparation method thereof

An amphiphilic copolymer and double grafting technology, applied in the field of polyolefin materials, can solve the problems of poor thermal stability and single performance of polyoxazoline, and achieve the effects of reducing water absorption, improving comprehensive performance and increasing material toughness

Active Publication Date: 2019-07-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The inventors of the present invention have found through research that the use of macromolecular initiators with active initiation sites of benzyl chloride side groups, such as poly-p-chloromethylstyrene or styrene and p-chloromethylstyrene copolymers, through Grafting from (Grafting from) method, respectively initiates the polymerization of isobutylene monomer and oxazoline monomer, and prepares a kind of double grafting with styrene-based polymer as the main chain and polyisobutylene and polyoxazoline as branch chains respectively. Copolymers can give full play to the advantages of polyoxazoline, such as hydrophilicity, biocompatibility, and antibacterial properties, while the presence of styrene-based polymer main chains and polyisobutylene branches improves polyoxazoline performance. The defect of poor stability, at the same time, the existence of polyisobutylene flexible chain can improve the toughness of the material, thus further broadening the application field of the material

Method used

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  • Ternary double-grafted amphiphilic copolymer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mix isobutylene (IB) with solvent (n-Hex / CH 2 Cl 2 =4 / 6) were mixed, the IB concentration was 1 M, and the total volume was 20 mL. At -80°C, the PVBC (M n =55kg / mol) macromolecular initiator is dissolved in the above-mentioned IB solution, under stirring, add and contain isopropanol (iPrOH), FeCl 3 Dichloromethane solution, trigger IB polymerization reaction, so that PVBC, FeCl 3 , The molar ratio of iPrOH to IB is 1.8×10 -4 : 2.2×10 -2 : 2.8×10 -2 : 1, polymerize for 5 minutes, then add pre-cooled 2mL ethanol to terminate the reaction; the reaction system is washed with ethanol and hexane in turn, and repeated three times to remove residual monomers, Lewis acid, etc., and further vacuum-dried at 40°C for 7 hours to obtain PVBC-g after drying 1 -PIB single-graft copolymer, the grafting rate of polyisobutylene branched chain is 4%, and the grafting amount is 36%.

[0049] At 16°C, weigh 0.1g of the above PVBC-g 1-PIB single-graft copolymer, dissolved in a mixed ...

Embodiment 2

[0054] The preparation method of poly-p-chloromethylstyrene-g-polyisobutylene binary graft copolymer is the same as embodiment 1, obtains PVBC-g 1 -PIB single-graft copolymer, wherein the grafting rate of polyisobutylene is 4%, and the grafting amount is 36%.

[0055] Poly(p-chloromethylstyrene)-g 1 -Polyisobutylene-g 2 -The preparation method and aftertreatment method of poly(2-ethyl-2-oxazoline) ternary double graft amphiphilic copolymer are the same as embodiment 1, but the mol ratio of potassium iodide and monomer is 1.6 * 10 -2 , get PVBC-g 1 -PIB-g 2 -PEOx double-grafted amphiphilic copolymer, wherein: the grafting rate of polyisobutylene is 4%, and the grafting amount is 30%; the grafting rate of polyoxazoline is 60%, and the grafting amount is 16%.

[0056] Poly(p-chloromethylstyrene)-g 1 -Polyisobutylene-g 2 -Poly(2-ethyl-2-oxazoline) ternary double-grafted amphiphilic copolymer forms a film with a contact angle of 65°, is hydrophilic, and swells in water.

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Embodiment 3

[0059] The preparation method of poly-p-chloromethylstyrene-g-polyisobutylene binary graft copolymer is the same as embodiment 1, obtains PVBC-g 1 -PIB single-graft copolymer, wherein the grafting rate of polyisobutylene is 4%, and the grafting amount is 36%.

[0060] Poly(p-chloromethylstyrene)-g 1 -Polyisobutylene-g 2 -The preparation method and aftertreatment method of poly(2-ethyl-2-oxazoline) ternary double graft amphiphilic copolymer are the same as embodiment 1, but the mol ratio of potassium iodide and monomer is 1.1 * 10 -2 , get PVBC-g 1 -PIB-g 2 -PEOx double-grafted amphiphilic copolymer, wherein: the grafting rate of polyisobutylene is 4%, and the grafting amount is 25%; the grafting rate of polyoxazoline is 76%, and the grafting amount is 29%.

[0061] The prepared ternary double-graft amphiphilic copolymer has a film contact angle of 48°, and the graft modification makes the ternary double-graft amphiphilic copolymer hydrophilic and swells in water.

[0062]...

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Abstract

The invention belongs to the field of polyolefin materials, and relates to a ternary double-grafted amphiphilic copolymer and a preparation method thereof. The ternary double-grafted amphiphilic copolymer adopts a styrene polymer chain segment as a main chain and adopts a polyisobutene chain segment and a poly(oxazoline) chain segment as branched chains respectively. According to the ternary double-grafted amphiphilic copolymer, dominant properties such as hydrophilicity, biocompatibility, antibacterial property and the like of poly(oxazoline) are exerted fully, and meanwhile, in the presenceof the styrene polymer chain segment and the polyisobutene branched chain, defects of single property and poor heat stability of poly(oxazoline) are overcome and the application of the ternary double-grafted amphiphilic copolymer material to the biomedicine is further broadened.

Description

technical field [0001] The invention belongs to the field of polyolefin materials, in particular, relates to a ternary double-graft amphiphilic copolymer and a preparation method thereof, more specifically, relates to a double-graft copolymer with a hydrophobic styrene-based polymer segment The main chain is branched with hydrophobic polyisobutylene segment and hydrophilic polyoxazoline segment respectively. Background technique [0002] Oxazoline is a five-membered heterocyclic compound with a carbon-nitrogen double bond in its molecule. Polyoxazoline is a polymer obtained by ring-opening cationic polymerization of oxazoline monomers. Polyoxazoline has the advantages of good biocompatibility, chemical stability, thermal stability, non-toxicity and environmental responsiveness, among which poly(2-ethyl-2-oxazoline) has been approved by the Food and Drug Administration (FDA ) certification. The performance of polyoxazoline can be adjusted by changing the monomer side chain...

Claims

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Application Information

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IPC IPC(8): C08G73/06C08F257/00C08F257/02C08F210/10
CPCC08F257/00C08F257/02C08G73/06C08F210/10
Inventor 吴一弦窦灿煜张彦君
Owner BEIJING UNIV OF CHEM TECH