以细菌纤维素为原料,合成2-羟基-3-磺酸基丙基细菌纤维素醚,采用红外光谱仪对产物结构进行了分析,用正交设计法研究了2-羟基-3-磺酸基丙基细菌纤维素醚合成的最佳工艺条件。结果表明,在优化条件下合成的2-羟基-3-磺酸基丙基细菌纤维素...以细菌纤维素为原料,合成2-羟基-3-磺酸基丙基细菌纤维素醚,采用红外光谱仪对产物结构进行了分析,用正交设计法研究了2-羟基-3-磺酸基丙基细菌纤维素醚合成的最佳工艺条件。结果表明,在优化条件下合成的2-羟基-3-磺酸基丙基细菌纤维素醚交换容量为0.481 mm ol/g。展开更多
研究了丁苯类(PSB150)、苯丙类(FX7000)及EVA类(5010N)3种不同类型可再分散乳胶粉及其掺量、3种不同黏度羟甲基丙基纤维素醚及其掺量对湿铺防水卷材专用水泥基粘结剂抗压强度、抗折强度、压折比、拉伸粘结强度及其与防水卷材剥离强度的...研究了丁苯类(PSB150)、苯丙类(FX7000)及EVA类(5010N)3种不同类型可再分散乳胶粉及其掺量、3种不同黏度羟甲基丙基纤维素醚及其掺量对湿铺防水卷材专用水泥基粘结剂抗压强度、抗折强度、压折比、拉伸粘结强度及其与防水卷材剥离强度的影响。结果表明,随着胶粉掺量的增加,抗压强度和压折比逐渐减小,抗折强度、拉伸粘结强度及其与防水卷材剥离强度逐渐提高,胶粉掺量≥6%时,变化趋于平缓;3种胶粉中的丁苯类(PSB150)的综合性能最佳。随着纤维素醚掺量的增加,湿铺防水卷材专用水泥基粘结剂的抗压强度、抗折强度、压折比及其与防水卷材剥离强度逐渐降低,保水率及拉伸粘结强度逐渐提高,稠度先增大后减小,纤维素醚掺量≥0.2%时,稠度变化趋于平缓;3种纤维素醚中,以黏度为10 000 m Pa·s的纤维素醚综合性能最佳。展开更多
With potassium persulfate (KPS) as initiator, graft copolymerization of ethyl acrylate (EA) onto water-soluble hydroxypropyl methylcellulose (HPMC) was investigated in aqueous medium. Effects of monomer concentration,...With potassium persulfate (KPS) as initiator, graft copolymerization of ethyl acrylate (EA) onto water-soluble hydroxypropyl methylcellulose (HPMC) was investigated in aqueous medium. Effects of monomer concentration, initiator concentration, matrix concentration, and reaction temperature on the percentage of grafting (G) and grafting efficiency (G_E) were studied. The results show that G and G_E values both increase with the the increase of EA concentration and KPS concentration; when raising HPMC concentration from 0.12 mmol/L to 0.47 mmol/L, G decreases, while G_E increases;and when raising reaction temperature from 50 ℃ to 65 ℃,G increases, but G_E decreases. In addition, the graft copolymers were characterized by Fourier transform infrared (FTIR) spectra and transmission electron microscopy (TEM) methods.展开更多
文摘研究了丁苯类(PSB150)、苯丙类(FX7000)及EVA类(5010N)3种不同类型可再分散乳胶粉及其掺量、3种不同黏度羟甲基丙基纤维素醚及其掺量对湿铺防水卷材专用水泥基粘结剂抗压强度、抗折强度、压折比、拉伸粘结强度及其与防水卷材剥离强度的影响。结果表明,随着胶粉掺量的增加,抗压强度和压折比逐渐减小,抗折强度、拉伸粘结强度及其与防水卷材剥离强度逐渐提高,胶粉掺量≥6%时,变化趋于平缓;3种胶粉中的丁苯类(PSB150)的综合性能最佳。随着纤维素醚掺量的增加,湿铺防水卷材专用水泥基粘结剂的抗压强度、抗折强度、压折比及其与防水卷材剥离强度逐渐降低,保水率及拉伸粘结强度逐渐提高,稠度先增大后减小,纤维素醚掺量≥0.2%时,稠度变化趋于平缓;3种纤维素醚中,以黏度为10 000 m Pa·s的纤维素醚综合性能最佳。
文摘With potassium persulfate (KPS) as initiator, graft copolymerization of ethyl acrylate (EA) onto water-soluble hydroxypropyl methylcellulose (HPMC) was investigated in aqueous medium. Effects of monomer concentration, initiator concentration, matrix concentration, and reaction temperature on the percentage of grafting (G) and grafting efficiency (G_E) were studied. The results show that G and G_E values both increase with the the increase of EA concentration and KPS concentration; when raising HPMC concentration from 0.12 mmol/L to 0.47 mmol/L, G decreases, while G_E increases;and when raising reaction temperature from 50 ℃ to 65 ℃,G increases, but G_E decreases. In addition, the graft copolymers were characterized by Fourier transform infrared (FTIR) spectra and transmission electron microscopy (TEM) methods.
