A novel AB3-type monomer was prepared from gallic acid and DL-2-aminobutyric acid, and used for the synthesis of the biocompatible hyperbranched poly(ester-amide)s by self-polycondensation. The polymers were character...A novel AB3-type monomer was prepared from gallic acid and DL-2-aminobutyric acid, and used for the synthesis of the biocompatible hyperbranched poly(ester-amide)s by self-polycondensation. The polymers were characterized via FTIR and NMR spectroscopy and thermal analysis, and the average degree of branching of the polymers was estimated to be 0.75. The polymers with abundant acetyl end groups were found to be amorphous with lower intrinsic viscosity, better thermal stability and excellent solubility.展开更多
A novel cyclodextrin-containing polymer was prepared by graftingβ-cyclodextrin onto the backbone of poly(D,L-lactic acid)(PLA).First,mono(6-(2-aminoethyl)amino-6-deoxy)-β-cyclodextrin(β-CD-6-en)was prepared by sulf...A novel cyclodextrin-containing polymer was prepared by graftingβ-cyclodextrin onto the backbone of poly(D,L-lactic acid)(PLA).First,mono(6-(2-aminoethyl)amino-6-deoxy)-β-cyclodextrin(β-CD-6-en)was prepared by sulfonylation and amination ofβ-cyclodextrin and modified poly(D,L-lactic acid)(MPLA)was prepared by free radical polymerization of maleic anhydride and PLA.Then,grafting ofβ-cyclodextrin derivative to MPLA backbone was carried out by N-acylation reaction of MPLA andβ-CD-6-en in dimethyl formamide.The...展开更多
Poly (3-hydroxy alkanoate)s, PHAs, have been very attractive as biomaterials due to their biodegradability and biocompatibility. These hydrophobic natural polyesters, PHAs, need to have hydrophilic character particula...Poly (3-hydroxy alkanoate)s, PHAs, have been very attractive as biomaterials due to their biodegradability and biocompatibility. These hydrophobic natural polyesters, PHAs, need to have hydrophilic character particularly for drug delivery systems. In this manner, poly (ethylene glycol) (PEG) and hydrophilic functional groups such as amine, hydroxyl, carboxyl and sulfonic acid have been introduced into the PHAs in order to obtain amphiphilic polymers. This review involves in the synthesis and characterization of the amphiphilic PHAs.展开更多
The biocomposite films were prepared from poly(L-lactic acid)and cellulose nanocrystals.To improve interfacial compatibility of hydrophilic cellulose nanocrystals with hydrophobic matrix polymer as well as to provide ...The biocomposite films were prepared from poly(L-lactic acid)and cellulose nanocrystals.To improve interfacial compatibility of hydrophilic cellulose nanocrystals with hydrophobic matrix polymer as well as to provide the osteoconductive properties,cellulose was functionalized with poly(glutamic acid).The modified cellulose nanocrystals were better distributed and less aggregated within the matrix,which was testified by scanning electron,optical and polarized light microscopy.According to mechanical tests,composites filled with nanocrystals modified with PGlu demonstrated higher values of Young’s modulus,elongation at break and tensile strength.Incubation of composite materials in model buffer solutions for 30 weeks followed with staining of Ca^(2+)deposits with Alizarin Red S assay testified better mineralization of materials containing PGlu-modified cellulose nanocrystals as filler.As the result of in vivo experiment,the developed composite materials showed less level of inflammation in comparison with pure polymer matrix and composites filled with non-functionalized cellulose nanocrystals.展开更多
Anisotropic surface topography is known to induce the contact guidance of cells, and facile and biocompatible approaches of the physical modification of the pertinent matrix surfaces are thus meaningful for biomateria...Anisotropic surface topography is known to induce the contact guidance of cells, and facile and biocompatible approaches of the physical modification of the pertinent matrix surfaces are thus meaningful for biomaterials. Herein, we put forward a sugar-fiber imprinting technique to generate microgrooves on hydrophobic polymers demonstrated by the poly（lactic-eo-glycolic acid） （PLGA） films. Microgrooves were conveniently generated after removing sugar fibers simply by water. The resulting locally anisotropic microgrooves were confirmed to elongate the cells cultured on the surface.展开更多
Recently,multifunctional polymers for protein conjugation have been facilely synthesized through the multicomponent reactions(MCRs).In this mini-review,current progress in the generation of multifuncti onal polymers w...Recently,multifunctional polymers for protein conjugation have been facilely synthesized through the multicomponent reactions(MCRs).In this mini-review,current progress in the generation of multifuncti onal polymers with protei n-reactive groups via MCRs is summarized.These mult functional polymers react with model therapeutic proteins,forming multifunctional polymer-protein conjugates,which are prototypes of sophisticated theranostic agents and antibacterial vaccine candidates.In comparison with the traditional multi-step synthesis,the preparation of multifunctional polymers for protein conjugation through MCRs is straightforward and convenient.Due to these properties,MCRs have the potential to become a new general strategy to achieve polymer-protein conjugates for biological and medical applications.展开更多
A pseudo AB 2 monomer,N-(2-acetoxyl ethyl)-N-(2′,4′-dicarboxylic benzoyl) amine (F 2),was synthesized by two steps.Firstly the ring-opening reaction of 1,2,4-benzenetricarboxylic anhydride was carried out with ethan...A pseudo AB 2 monomer,N-(2-acetoxyl ethyl)-N-(2′,4′-dicarboxylic benzoyl) amine (F 2),was synthesized by two steps.Firstly the ring-opening reaction of 1,2,4-benzenetricarboxylic anhydride was carried out with ethanolamine resulting in N-(2-hydroxyl ethyl)-N-(2′,4′-dicarboxylic benzoyl) amine (F 1),and then F 1 was acetylized by acetic anhydride to afford F 2.The yields for F 1 and F 2 are 90% and 84.5%,respectively.By bulk polycondensation of F 2 catalyzed by Zn(OAc) 2,a novel hyperbranched poly(ester-amide) was effectively prepared in a yield of 92%.The structure of the product was characterized by mean of IR, 1H-NMR,DSC and TGA.The obtained polymer has good thermal properties as expected.The effect of the polymer on the rheological behavior of polycarbonate (PC) was studied by using Haake Rheomix 600.It was shown that the torque of melt PC was reduced by 70% with the addition of 5wt% of the obtained hyperbranched poly(ester-amide).展开更多
A hyperbranched poly(ester-amide)(HP) with hydroxyl end-groups was synthesized from diisopropanolamine (DIPA) cis-1,2-clyclohexane-dicarboxylic anhydride (HHPA) and pentaerythritol (PETL), and a kind of amphiphilic hy...A hyperbranched poly(ester-amide)(HP) with hydroxyl end-groups was synthesized from diisopropanolamine (DIPA) cis-1,2-clyclohexane-dicarboxylic anhydride (HHPA) and pentaerythritol (PETL), and a kind of amphiphilic hyperbranched macromolecule was prepared with the hydroxyl end-groups modified by the addition of polyethylene glycol monomethyl ether(M_W550, MPEG550).The structure of the macromolecules was characterized with IR, DSC, GPC and SEM.The results indicated that the hyperbranched poly(ester-amide) had narrow molecular mass distribution with polydispersity 1.47, and glass transformation temperature (T_g) 36℃.It was shown by SEM micrographs that the amphiphilic polymer in water solution exhibited nano-spherical particles dispersion with 50～100 nm diameter.展开更多
文摘A novel AB3-type monomer was prepared from gallic acid and DL-2-aminobutyric acid, and used for the synthesis of the biocompatible hyperbranched poly(ester-amide)s by self-polycondensation. The polymers were characterized via FTIR and NMR spectroscopy and thermal analysis, and the average degree of branching of the polymers was estimated to be 0.75. The polymers with abundant acetyl end groups were found to be amorphous with lower intrinsic viscosity, better thermal stability and excellent solubility.
基金Funded by the Natural Science Foundation of China(No.50603032)Education Commission of Chongqing(No.KJ090617)the Science and Technology Plan Project of Jiulongpo District,Chongqing,China(No.2008Q95)
文摘A novel cyclodextrin-containing polymer was prepared by graftingβ-cyclodextrin onto the backbone of poly(D,L-lactic acid)(PLA).First,mono(6-(2-aminoethyl)amino-6-deoxy)-β-cyclodextrin(β-CD-6-en)was prepared by sulfonylation and amination ofβ-cyclodextrin and modified poly(D,L-lactic acid)(MPLA)was prepared by free radical polymerization of maleic anhydride and PLA.Then,grafting ofβ-cyclodextrin derivative to MPLA backbone was carried out by N-acylation reaction of MPLA andβ-CD-6-en in dimethyl formamide.The...
文摘Poly (3-hydroxy alkanoate)s, PHAs, have been very attractive as biomaterials due to their biodegradability and biocompatibility. These hydrophobic natural polyesters, PHAs, need to have hydrophilic character particularly for drug delivery systems. In this manner, poly (ethylene glycol) (PEG) and hydrophilic functional groups such as amine, hydroxyl, carboxyl and sulfonic acid have been introduced into the PHAs in order to obtain amphiphilic polymers. This review involves in the synthesis and characterization of the amphiphilic PHAs.
基金funded by the Russian Ministry of Education and Science(state contract no.14.W03.31.0014,MegaGrant).
文摘The biocomposite films were prepared from poly(L-lactic acid)and cellulose nanocrystals.To improve interfacial compatibility of hydrophilic cellulose nanocrystals with hydrophobic matrix polymer as well as to provide the osteoconductive properties,cellulose was functionalized with poly(glutamic acid).The modified cellulose nanocrystals were better distributed and less aggregated within the matrix,which was testified by scanning electron,optical and polarized light microscopy.According to mechanical tests,composites filled with nanocrystals modified with PGlu demonstrated higher values of Young’s modulus,elongation at break and tensile strength.Incubation of composite materials in model buffer solutions for 30 weeks followed with staining of Ca^(2+)deposits with Alizarin Red S assay testified better mineralization of materials containing PGlu-modified cellulose nanocrystals as filler.As the result of in vivo experiment,the developed composite materials showed less level of inflammation in comparison with pure polymer matrix and composites filled with non-functionalized cellulose nanocrystals.
文摘Anisotropic surface topography is known to induce the contact guidance of cells, and facile and biocompatible approaches of the physical modification of the pertinent matrix surfaces are thus meaningful for biomaterials. Herein, we put forward a sugar-fiber imprinting technique to generate microgrooves on hydrophobic polymers demonstrated by the poly（lactic-eo-glycolic acid） （PLGA） films. Microgrooves were conveniently generated after removing sugar fibers simply by water. The resulting locally anisotropic microgrooves were confirmed to elongate the cells cultured on the surface.
基金This research was supported by the National Science Founda-tion of China(21971141)"Chenguang Program 18CG01"supported by Shanghai Education Development Foundation and Shanghai Municipal Education.
文摘Recently,multifunctional polymers for protein conjugation have been facilely synthesized through the multicomponent reactions(MCRs).In this mini-review,current progress in the generation of multifuncti onal polymers with protei n-reactive groups via MCRs is summarized.These mult functional polymers react with model therapeutic proteins,forming multifunctional polymer-protein conjugates,which are prototypes of sophisticated theranostic agents and antibacterial vaccine candidates.In comparison with the traditional multi-step synthesis,the preparation of multifunctional polymers for protein conjugation through MCRs is straightforward and convenient.Due to these properties,MCRs have the potential to become a new general strategy to achieve polymer-protein conjugates for biological and medical applications.
文摘A pseudo AB 2 monomer,N-(2-acetoxyl ethyl)-N-(2′,4′-dicarboxylic benzoyl) amine (F 2),was synthesized by two steps.Firstly the ring-opening reaction of 1,2,4-benzenetricarboxylic anhydride was carried out with ethanolamine resulting in N-(2-hydroxyl ethyl)-N-(2′,4′-dicarboxylic benzoyl) amine (F 1),and then F 1 was acetylized by acetic anhydride to afford F 2.The yields for F 1 and F 2 are 90% and 84.5%,respectively.By bulk polycondensation of F 2 catalyzed by Zn(OAc) 2,a novel hyperbranched poly(ester-amide) was effectively prepared in a yield of 92%.The structure of the product was characterized by mean of IR, 1H-NMR,DSC and TGA.The obtained polymer has good thermal properties as expected.The effect of the polymer on the rheological behavior of polycarbonate (PC) was studied by using Haake Rheomix 600.It was shown that the torque of melt PC was reduced by 70% with the addition of 5wt% of the obtained hyperbranched poly(ester-amide).
文摘A hyperbranched poly(ester-amide)(HP) with hydroxyl end-groups was synthesized from diisopropanolamine (DIPA) cis-1,2-clyclohexane-dicarboxylic anhydride (HHPA) and pentaerythritol (PETL), and a kind of amphiphilic hyperbranched macromolecule was prepared with the hydroxyl end-groups modified by the addition of polyethylene glycol monomethyl ether(M_W550, MPEG550).The structure of the macromolecules was characterized with IR, DSC, GPC and SEM.The results indicated that the hyperbranched poly(ester-amide) had narrow molecular mass distribution with polydispersity 1.47, and glass transformation temperature (T_g) 36℃.It was shown by SEM micrographs that the amphiphilic polymer in water solution exhibited nano-spherical particles dispersion with 50～100 nm diameter.
