羧基丙酸羟丙基甲基纤维素酯CPHPMC的制备与特性研究模板

下载后可任意编辑β-羧基丙酸羟丙基甲基纤维素酯(β-CPHPMC)的制备与特性讨论沈纪洋天津大学材料科学与工程学院, 天津市 300072摘要本文以羟丙基甲基纤维素( HPMC) 为原料、 丁二酸酐为酯化剂、 无水醋酸钠为催化剂, 在醋酸中经过改变反应温度、 酯化剂和催化剂的用量, 制备了五种具有不同 β-羧基丙酰基含量的 β-羧基丙酸羟丙基甲基纤维素酯(β-CPHPMC)。结果表明: β-羧基丙酰基含量越多, 分布越均匀, β-CPHPMC 凝胶温度越低, 最低降至41.95℃, 而相同浓度的 HPMC 的凝胶温度为 59.85℃。关键词: β-羧基丙酸羟丙基甲基纤维素酯羟丙基甲基纤维素丁二酸酐 β-羧基丙酰基凝胶温度PreparationandCharacterizationofβ-carboxypropionateHydroxypropylmethylCellulose(β-CPHPMC)SHENJi-yang(SchoolofMaterialScienceandEngineering,TianjinUniversity,Tianjin300072,China)Abstractβ-carboxypropionatehydroxypropylmethylcellulose(β-CPHPMC)wassynthesizedfromhydroxypropylmethylcellulose(HPMC)byesterificationusingsuccinicanhydrideasesterifyingagent,anhydroussodiumacetateascatalystandaceticacidasorganicsolvent.Byvaryingreactiontemperatureandtheamountofesterifyingagentandcatalyst,fivekindsofβ-CPHPMCswiththedifferentcontentofβ-carboxypropionylgroupswereprepared.Thecontentofβ-carboxypropionylgroupsinβ-CPHPMCwasdeterminedbyconductometrictitrationataconstanttemperatureof29℃.Thestructureandpropertiesofβ-CPHPMCwereanalyzedbyIR,viscometerandrheometer.Theresultshowedthatthenumberofβ-下载后可任意编辑carboxypropionylgroupspercellulosicmacromolecularchainwasfrom6.57to12.42,thatthegelationtemperatureof1wt％β-CPHPMCsolutionsrangedfrom48.7℃to41.95℃,whereasthatofa1wt%HPMCsolutionwas59.85℃andthatwithanincreaseinβ-carboxypropionylcontentanddistributionhomogeneity,thegelationtemperatureofβ-CPHPMCdecreasedbutitsgelstrengthincreased.Keywords:β-carboxypropionatehydroxypropylmethylcellulose;succinicanhydride;hydroxypropylmethylcellulose;β-carboxypropionylgroup;gelationtemperature;gelstrength作者简介: 沈纪洋( 1981－) , 男, 硕士生, 从事纤维素醚的化学改性讨论, 电话:, E-mail:源于天然资源的纤维素衍生物羟丙基甲基纤...