差示量热扫描法分析紫胶蜡的热性质  

Differential Scanning Calorimetric Study of Thermal Characteristics of Lac Wax

作　　者：张汝国[1] 郑华[1] 张弘[1] 甘瑾[1] 于连松[1] 张雯雯[1] 

机构地区：[1]中国林业科学研究院资源昆虫研究所,国家林业局资源昆虫培育与利用重点实验室,云南昆明650224

出　　处：《食品科学》2009年第17期137-140,共4页Food Science

基　　金：国家林业局“948”项目(2008-4-78);国家林业局推广项目([2005]72)

摘　　要：为了研究紫胶蜡的热性质,该实验用差示量热扫描法(DSC)分别测定不同方法处理的紫胶蜡熔点、熔化热焓及结晶热焓、比热容变化。结果表明:不同方法处理的紫胶蜡存在较大差异,熔点最高为84.84℃,最低为67.10℃;熔化热焓最高为201.50J/g,最低为158.90J/g;结晶热焓最高为191.80J/g,最低为157.05J/g;熔化热焓和结晶热焓与熔点呈正相关,且结晶热焓小于熔化热焓;比热容变化(ΔCp)最低为10.212J/g·K,最高为16.716J/g·K,且与熔点高低没有相关性。DSC可以用于紫胶蜡的热物理特性的定性及定量测试。To investigate the thermal characteristics of lac wax, melting point and enthalpy （△Hc）, crystallization enthalpy （△Hp）, and specific heat capacity change oflac wax （△Cp） prepared with different organic solvents were analyzed using differential scanning calorimetry （DSC）. Big differences were found in the thermal characteristics oflac wax prepared with different organic solvents： the melting point varied in the range of 67.10 -- 84.84 ℃, the melting enthalpy 158.90 -- 201.50 J/g, and the crystallization enthalpy 157.05 -- 191.80 J/g. The melting and the crystallization enthalpy both were positively correlated with the melting point and the former was higher than the latter. The maximum specific heat capacity difference was found to be 16. 716 J/g · K and the minimum 10.212 J/g · K, and there was no correlation between the specific heat capacity difference and the melting. It is feasible to use DSC to analyze qualitatively and quantitatively the thermal characteristics of lac wax.

关 键 词：紫胶蜡 差示量热扫描法(DSC) 热性质 

分 类 号：TS932[轻工技术与工程] TQ645.93[化学工程—精细化工]