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Tian R.,Hubei University | Wang X.,Hubei University | Wang X.,Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials | Chen R.,Hubei University | And 3 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2011

Ring-opening polymerization of L-lactide was successfully used to prepare single-walled carbon nanotube/poly(L-lactide)(SWCNTs/PLA) composites, and its degradability and thermal stability were explored. Fourier transform infrared (FTIR) spectra, Raman spectra, thermogravimetric (TGA) analysis and scanning electron microscopy were used to characterize the products.The results show that ring-opening polymerization takes place between the functionalized SWCNTs and L-lactide, resulting in attachment of poly(L-lactide) (PLA) chains to SWCNTs, and the SWCNTs/PLA composites can be hydrolyzed under alkaline solution. The DSC study suggests that the presence of functionalized SWCNTs can enhance the glass transition temperature (Tg) of the composite campared with pure PLA. Source


Liu D.,Hubei University | Zeng S.-M.,Hubei University | Hu Q.,Hubei University | Xu Z.-S.,Hubei University | Xu Z.-S.,Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2010

Highly branched poly(urethane-imide) (HBPUI) was synthesized via A 2+B 3 approach using isophorone diisocyante (IPDI), polycarbonatediol (PCDL), 3, 3', 4, 4'-benzophen-onetetracarboxylic dianhydride (BTDA) and poly(oxyalkylene) triamine (ATA) as materials. The structure of the products was characterized by Fourier transform infrared spectroscopy(FT-IR). The properties were measured by rotational rheometer, differential scanning calorimetry(DSC), thermal gravimetric analysis(TGA) and tensile tests. The HBPUI shows lower viscosity but a higher Tg than that of line poly(urethane-imide)(LPUI). Thermal gravimetric analysis indicates that the thermal degradation of poly(urethane-imide) occurs above 300 °C, which is higher in comparison with conventional highly branched polyurethane(HBPU), confirming that the introduction of imide function improves the thermal stability of HBPU. Tensile tests reveal that the tensile strength of HBPUI is obviously improved by increasing the content of hard segment and the molar ratio of [A 2]/[B 3]. however, the elongation at break displays a opposite trend. Source


Wang L.,Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials | Huang M.,Hubei University | Xu Z.,Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials | Xu Z.,Hubei University | And 2 more authors.
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2012

Nanoscale silica sol was made at ambient temperature by Stöber method and modified with 3-(trimethoxysilyl)propylmethacrylate (KH-570). The silica sol/fluoroacrylate nanocomposite emulsion was prepared by emulsion polymerization in the co-presence of an anionic and a nonionic emulsifier. The morphology of latex particles was characterized. The composition and properties of the copolymer, the stability of the emulsion and the performance of the emulsion film were tested. The results show that the nanocomposite particles have distinct core-shell structure; the emulsion has good stabilities of storage, dilution, heat-resistant and cold-resistance; the film made of the nanocomposite has water absorption of 12.50% and water contact angle of 93.5°; the nanocomposite's thermal stability is superior to that of general polyacrylate copolymer and fluorinated polyacrylate copolymer. Source


Yan S.,Hubei University | Huang M.,Hubei University | Chen C.,Hubei University | Xu Z.,Hubei University | And 3 more authors.
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2011

The authors synthesized three kinds of polyimides via conventional two-step thermal or chemical imidization process by using 2, 2-bis[4-(4-aminophenoxy)phenyl]propane(BAPP) and 4-phenyl-2, 6-bis (4-aminophenyl)pyridine (PBAP) as diamine, 2, 2-bis [4-(3, 4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) as dianhydride in dimethylformamide (DMF) solvent. The structure of the copolymers was analyzed by Fourier transform infrared spectroscopy(FTIR). The characteristic peaks of the polyimides in the FTIR spectra appeared around 1780, 1720, 725 cm-1. The properties of the products were measured by solubility tests, X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, tensile tests and water uptake tests. The polyimides so prepared were soluble in majority of conventional organic solvents and had good thermal stability. The polyimide films' initial decomposition temperatures were over 500°C, temperatures of 10% mass loss were 531.1-547.1°C and residue at 800°C was 40.7%-67.2% in nitrogen atmosphere. The tensile strength, tensile modulus and tensile strain at break of the polyimide films were 105.8-128.9 MPa, 2.14-2.32 GPa and 10.2%-18.3%, respectively. The water uptakes of the films reached 0.78%-0.96%. Source


Huang M.,Hubei University | Wang L.,Hubei University | Shen J.,Hubei University | Yi C.,Hubei University | And 3 more authors.
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics | Year: 2011

A kind of soluble fluorinated poly (pyridine-imide) was synthesized via the conventional two-step method with 4-phenyl-2,6-bis[3-(4-amino-2-trifluoromethyphenoxy)phenyl] pyridine(m,p-6FPAPP) as the diamine monomer, pyromellitic dianhydride(PMDA) and 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) as the dianhydride monomers in dimethylformamide (DMF). The results show that characteristic absorption peaks of polyimide(PI) appear around 1780, 1720, 1380 cm -1 in the Fourier transform infrared spectroscopy (FTIR). The poly (pyridine-imide) so prepared can be soluble in conventional organic solvents. The obtained poly (pyridine-imide) has glass transition temperature of 263.3°C and the temperature at 10% mass loss of 563.8°C, and the residue at 800°C of 59.6% in nitrogen atmosphere. It exhibits UV absorption bands in the region of 200-350 nm and strong purple fluorescence emission peaks in the vicinity of 400 nm. Furthermore, the fluorescence intensity increases dramatically after protonation with hydrochloric acid. Source

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