基于PEG類聚物的雙溫敏性嵌段聚合物的合成及性質(zhì)研究
[Abstract]:The stimulation responsive polymer has a wide developing prospect in the fields of biological medicine, tissue engineering, artificial muscle and drug carrier, among which, most of the research is temperature-sensitive polymer. Based on the fact that the single stimulus-responsive polymer has not been able to meet the needs of modern life, the research of double-temperature sensitive polymer is increasing gradually, providing more flexible space for directional immobilization of protein, design synthesis of temperature-sensitive polymer and so on. Oligopolyethylene glycol methyl ether methacrylate (OEGMA) and 2-methyl-2-acrylic-2-(2-methoxyethoxy) ethyl ester (MEO2MA) as a novel temperature sensitive monomer family have a low poly (ethylene glycol) side chain, Poly2-methyl-2-acrylic-2-(2-methoxyethoxy) ethyl ester (PMEO2MA) reported in the literature has a low critical dissolution temperature (LCST) of 26 & deg; C, and the LCST of polyoligoethylene glycol methyl ether methacrylate (POEGMA) is 90 & deg; C, Thus, the LCST of their random copolymer P (MEO2MA-co-OEGMA) can be adjusted by varying the molar ratio of the two monomers. Both the homopolymers based on these two monomers and their random copolymers are PEG analogs, thus having good water solubility and biocompatibility. Polyethylene glycol (PEG) is a kind of hydrophilic polymer, good biocompatibility, non-toxic, immunity-free and so on, so it is widely used in biomedicine and other fields. N-hydroxymethylglucamine (HMAM) with functional hydroxyl groups is a hydrophilic monomer which is introduced into the temperature-sensitive polymer to enhance the hydrophilicity of the polymer, thereby adjusting the LCST of the polymer. Two kinds of double-temperature sensitive block polymers were synthesized by using hydrophilic PEG, temperature sensitive monomer MEO2MA and OEGMA as well as hydrophilic monomer HMAM. First, by reversible addition-fragmentation chain transfer radical polymerization (RAFT) synthesis of ABC-type bis-temperature sensitive triblock polymer PEG-b-PMEO2MA-b-P (MEO2MA-co-OEGMA), the aqueous solution properties, micelle and gelation behavior of the polymer were studied. Two-temperature sensitive block polymers P (MEO2MA-co-HMAM)-b-PMEO2MA-b-PEG-b-PMEO2MA-b-P (MEO2MA-co-HMAM) of ABCB Atype were synthesized using atom transfer radical polymerization (ATRP) technique. The specific work is as follows: 1. The ABC-type bis-temperature sensitive triblock copolymer PEG-b-PMEO2MA-b-P (MEO2MA-co-OEGMA) was synthesized by the RAFT polymerization method. The structure and molecular weight of the polymer were characterized by nuclear magnetic resonance hydrogen spectroscopy (1H NMR), infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC); It was found that the double temperature sensitivity of the polymer was related to the polymerization degree of two temperature sensitive blocks and the feeding ratio of the two monomers in the P (MEO2MA-co-OEGMA) chain segment, and the double temperature sensitivity of the polymer was controlled by changing the degree of polymerization and the feeding ratio of the two monomers, so that the two temperature sensitive blocks had continuous dehydration and aggregation. By means of dynamic light scattering (DLS), the variation trend of particle size with temperature in aqueous polymer solution was studied. The stable self-assembly process of polymer aqueous solution in two stages under the action of heat induction was studied, and the transmission electron microscope (TEM) was used. Micellar morphology and micellar behavior of polymer aqueous solution were studied by fluorescence probe technique and surface tension instrument. Finally, the sol-gel transition behavior of polymer aqueous solution under temperature and concentration was studied by the experiment of vial inversion and rheological test. The results showed that: The sol-gel transition temperature has an important relationship with the concentration of aqueous polymer solution. With the increase of the concentration of aqueous polymer solution, the transition temperature of sol-gel decreases, and vice versa, the transition temperature of sol-gel increases. Two-temperature sensitive pentblock polymers P (MEO2MA-co-HMAM)-b-PMEO2MA-b-PEG-b-PMEO2MA-b-P (MEO2MA-co-HMAM) were synthesized by ATRP technology with Br-PEG-Br as macroinitiator and CuCl/ bpy as catalytic system. The composition structure, molecular weight and molecular weight distribution of polymer were characterized by 1H NMR, FT-IR and GPC. The temperature-sensitive behavior of polymer aqueous solution was studied by DLS using light transmittance test. "Nuclear-Shell" The results show that the change of the particle size of the aqueous polymer solution under the heat induction indicates that the phase transition of the aqueous polymer solution is reversible.
【學(xué)位授予單位】:陜西師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:O631.3
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