Cellulose carbamates (CC) were synthesized with microcrystalline cellulose as raw materials. The Fourier transform infrared spectra of CC with different nitrogen content were recorded. The accurate results of the nitr...Cellulose carbamates (CC) were synthesized with microcrystalline cellulose as raw materials. The Fourier transform infrared spectra of CC with different nitrogen content were recorded. The accurate results of the nitrogen content for CC can be obtained by using the deconvolution method when the nitrogen content is less than 3.5%. The relationship between the nitrogen content and the absorption intensity ratio of the corresponding separated absorption peaks in FTIR spectra has been expressed bg an equation precisely.展开更多
Terephthaloyl chloride （DB）-modified silk fibroin （SF） films were immersed into 1.5 times simulated body fluid （1.5 SBF） to regulate the mineralization of hydroxyapatite （HA） crystals at about 36.5 ℃ for 24 h...Terephthaloyl chloride （DB）-modified silk fibroin （SF） films were immersed into 1.5 times simulated body fluid （1.5 SBF） to regulate the mineralization of hydroxyapatite （HA） crystals at about 36.5 ℃ for 24 h. UV was used to prove that the new bonds form between the DB and SF. The structure and morphology of the SF/HA were investigated by FTIR, ICP, XRD and SEM. The results showed that the apatite deposited on the matrix of SF mainly was HA. HA was self-assembled on the matrix of SF and formed three- dimensional framework when the weight ratio of DB/SF was 0.30. The content of DB affected the structure and morphology of the anatite comoosites deoosited on the SF films.展开更多
文摘Cellulose carbamates (CC) were synthesized with microcrystalline cellulose as raw materials. The Fourier transform infrared spectra of CC with different nitrogen content were recorded. The accurate results of the nitrogen content for CC can be obtained by using the deconvolution method when the nitrogen content is less than 3.5%. The relationship between the nitrogen content and the absorption intensity ratio of the corresponding separated absorption peaks in FTIR spectra has been expressed bg an equation precisely.
基金the support of Natural Science Fund of Anhui Province(No.070414193)and the fund support of Key Laboratory of Environment-friendly Polymer Materials of Anhui Province
文摘Terephthaloyl chloride （DB）-modified silk fibroin （SF） films were immersed into 1.5 times simulated body fluid （1.5 SBF） to regulate the mineralization of hydroxyapatite （HA） crystals at about 36.5 ℃ for 24 h. UV was used to prove that the new bonds form between the DB and SF. The structure and morphology of the SF/HA were investigated by FTIR, ICP, XRD and SEM. The results showed that the apatite deposited on the matrix of SF mainly was HA. HA was self-assembled on the matrix of SF and formed three- dimensional framework when the weight ratio of DB/SF was 0.30. The content of DB affected the structure and morphology of the anatite comoosites deoosited on the SF films.
