聚合度作为一个重要影响因素对聚磷酸钙的性能必然产生影响.采用磷酸二氢钙作为原料,在不同聚合温度下制备了聚磷酸钙.采用31p核磁共振波谱测定聚磷酸钙的聚合度,评价聚合温度对聚合度及结构的影响,结合磷酸二氢钙差示扫描量热-热失重分析结果,提出了磷酸二氢钙缩聚反应的机理.结果表明,磷酸二氢钙缩聚产物以聚磷酸钙为主,当聚合温度低于1000℃时,升高聚合温度有利于聚合度的增大,1000℃以上则反之；此外,升高聚合温度促进环状结构(偏磷酸钙)的生成,其含量随聚合温度的升高而增大且1000℃以上增幅较大.
参考文献
| [1] | Zhang L F,Yang D J,Chen H C,et al.An ionically crosslinked hydrogel containing vancomycin coating on a porous scaffold for drug delivery and cell culture.International Journal of Pharmaceutics,2008,353(1/2):74-78. |
| [2] | Jiang L Y,Li Y B,Xiong C D.A novel composite membrane of chitosan-carboxymethyl cellulose polyelectrolyte complex membrane filled with nano-hydroxyapatite I.Preparation and properties.Journal of Materials Science:Materials in Medicine,2009,20(8):1645--1652. |
| [3] | Bai W,Chen D L,Zhang Z P,et al.Poly(para-dioxanone)/inorganic particle composites as a novel biomaterial.Journal of Biomedical Materials Research Part B:Applied Biomaterials,2009,90B(2):945-951. |
| [4] | Zhang D J,Zhang L F,Xiong Z C,et al.Preparation and characterization of biodegradable poly(D,L-lactide) and surface-modified bioactive glass composites as bone repair materials.Journal of Materials Science: Materials in Medicine,2009,20(10):1971-1978. |
| [5] | Lee Jinn-Shing,Hsu Chung-King.A study on thermal properties of β-Ca(PO3)2 whiskers and on devitrification mechanism of calcium phosphate glass system.Thermochimica Acta,1999,339(1/2):103-109. |
| [6] | Grynpas M D,Pilliar R M,Kandel R A,et al.Porous calcium polyphosphate scaffolds for bone substitute applications in vivo studies.Biomaterials,2002,23(9):2063-2070. |
| [7] | Qiu K,Wan C X,Zhao C S.Fabrication and characterization of porous calcium polyphosphate scaffolds.Journal of Materials Science,2006,41(8):2429-2434. |
| [8] | Ding Yu-Long,Chen Yuan-Wai,Qin Ying-Jie,et al.Effect of polymerization degree of calcium polyphosphate on its microstructure and in vitro degradation performance.Journal of Materials Science:Materials in Medicine,2008,19(3):1291-1295. |
| [9] | Wang Kai,Chen Fang-Ping,Liu Chang-Sheng,et al.The effect of polymeric chain-like structure on the degradation and cellular biocompatibility of calcium polyphosphate.Materials Science and Engineering C,2008,28(8):1572-1578. |
| [10] | Song Wei,Tian Meng,Chen Feng,et al.The study on the degradation and mineralization mechanism of ion-doped calcium polyphosphate in vitro.Journal of Biomedical Materials Research Part B:Applied Biomaterials,2009,89B(2):430-438. |
| [11] | Wiench J W,Pruski M,Tischendorf B,et al.Structural studies of zinc polyphosphate glasses by nuclear magnetic resonance.Journal of Non-Crystalline Solids,2000,263-264:101-110. |
| [12] | Wiench J W,Tischendorf B,Otaigbe J U,et al.Structure of zinc polyphosphate glasses studied by two-dimensional solid and liquid state NMR.Journal of Molecular Structure,2002,602-603:145-147. |
| [13] | Fletcher Joseph P,Krikpatrick R James,David Howell et al.31p magic-angle spinning nuclear magnetic resonance spectroscopy of calcium phosphate glasses.Journal of the Chemical Society,Faraday Transactions,1993,89(17):3297-3299. |
| [14] | Witter R,Hartmann P,Vogel J,et al.Measurements of chain length distributions in calcium phosphate glasses using 2D 31p double quantum NMR.Solid State Nuclear Magnetic Resonance,1998,13(3):189-200. |
| [15] | Emilia Celma de Oliveira Lima,José Machado Moita Neto,Fred Yuko Fujiwara,et al.Aluminum polyphosphate thermoreversible gels:A study by 31P and 27A1 NMR spectroscopy.Journal of Colloid and Interface Science,1995,176(2):388-396. |
| [16] | Omelon Sidney,Baer Andrew,Coyle Tom,et al.Polymeric crystallization and condensation of calcium polyphosphate glass.Materials Research Bulletin,2008,43(1):68-80. |
| [17] | Trommer J,Schneider M,Worzala H,et al.Structure determination of CaH2P2O7 from in situ powder diffraction data.Materials Science Forum:European Powder Diffraction,2000,321-324(6):374-379. |
| [18] | Lauren Jackson E,Kariuki Benson M,Smith Mark E,et al.Synthesis and structure of a calciumpolyphosphate with a unique crisscross arrangement of helical phosphate chains.Chemistry of Materials,2005,17(18):4642-4646. |
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