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羧甲基羟丙基纤维素溶液流变性质的研究 总被引:2,自引:0,他引:2
用旋转粘度计研究了羧甲基羟丙基纤维素(CMHPC)复合醚水溶液在25~80℃温度范围内的热稳定性,以及水溶液和盐溶液的流变性质。借助阿氏(Arrheaius)方程得到的CMHPC粘流活化能介于离子型羧甲基纤维素醚(PAC)和非离子型纤维素醚(HEC)之间。研究发现,CMHPC体系中羧甲基含量较高时流动曲线类似PAC,符合Ostwad-Der Waele幂律模型,而羟丙基含量较高时,流动曲线类似HEC,偏离幂律模型。在CMHPC水溶液中加入小分子电解质时,羧甲基受屏蔽,流变行为主要受羟丙基的影响,曲线将发生偏离。本文还考察了CMHPC溶液的抗盐能力。 相似文献
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羧甲基羟丙基纤维素溶液流变性质的研究 总被引:1,自引:0,他引:1
用旋转粘度计研究了羧甲基羟丙基纤维素(CMHPC)复合醚水溶液在25-80℃温度范围内的热稳定性,以及水溶液和盐溶液的流变性质.借助阿氏方程得到的CMHPC粘流活化能介于离子型羧甲基纤维素醚(PAC)和非离子型羟乙基纤维素醚(HEC)之间.研究发现,CMHPC体系中羧甲基含量较高时流动曲线类似PAC符合Ostwad-Der Waele幂律模型,而羟丙基含量较高时,流动曲线类似HEC,偏离幂律模型.在CMHPC水溶液中加入小分子电解质时,羧甲基受屏蔽,流变行为主要受羟丙基影响,曲线将发生偏离.本文还考察了CMHPC溶液的抗盐能力. 相似文献
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The reaction of Co(OAc)2 with bpe and 4,4'-dpdo in an aqueous-alcohol solution affords the formation of red crystals of [Co(H2O)2(bpe)(OAc)2](4,4'-dpdo (bpe = trans-1,2-bis(4- pyridyl)ethylene, 4,4'-dpdo = 4,4'-dipyridyl N,N'-oxide). The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of triclinic, space group P with a = 7.6146(9), b = 8.6691(11), c = 10.344011 A, α = 88.311(3), β = 76.992(3), γ = 75.809(3)°, V = 644.7613 A3, Z = 1, C26H28CoN4O8, Mr = 583.45, Dc = 1.503 g/cm3, μ = 0.724 mm-1, F(000) = 303, T = 223(2) K, the final R = 0.0477 and wR = 0.1177 for 3199 observed reflections with I > 2σ(I). In the crystal the cobalt atom is six-coordinated by oxygen atoms from two carboxylic molecules, two nitrogen atoms from the bpe ligands and two water molecules, completing an octahedral geometry. The structure of the title complex consists of neutral chains containing cobalt(II) ions bridged by mutually trans bpe molecules. The adjacent chains are connected through weak hydrogen bonds to form a two-dimensional structure. 相似文献
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1 临床资料6例小儿患者中女性4例,男性2例,年龄最大4岁,最小1112岁,平均年龄2岁6个月。湿疣发生的部位:2例男孩均发于肛周,4例女孩中3例为外阴与肛周联合受累,1例单独为外阴受累。6例患儿中有2例患儿的父母同患此病但已治愈,1例女孩疑被人污辱后发病。6例患儿中有2例患儿曾在院外经CO2激光治疗4次未愈,另4例为初诊患儿。2 治疗方法及疗效6例患儿中有5例请麻醉科予以基础麻醉(药物:氯氨酮),1例4岁患儿未用基础麻醉而仅用局麻。在基础麻醉后行治疗局部消毒,予以1%利多卡因局麻。CO2激光波长106μm,激光输出功率1~10W,光斑直径02~03… 相似文献
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