用差示扫描量热法（DAC）测定TESPT50%比热的研究

通过大量实验，分析了ＤＳＣ技术测定试样比热的准确度及影响因素。并通过ＤＳＣ测定ＴＥＳＰＴ５０％的比热这一重要物理常数来评定其合成性能、热稳定性以及加工温度范围，为配方筛选、材料的加工与应用提供另一方面的实验参考，并为热力学的计算提供数据。     

调制DSC法测定聚烯烃树脂的比热

用差示扫描量热仪(DSC)测定了聚丙烯、聚乙烯的比热值。用三种比热测量方法:ADSC调制DSC法、TOPEM调制DSC法、蓝宝石法。分析了三种方法的优缺点,探讨了调制DSC法测量比热的可行性。为聚烯烃材料生产、加工、成型等环节的热平衡核算提供准确的数据支持。     

差示扫描量热法测定固体催化剂比热

DSC法测定物质的比热,方法简便、快速,试样量少。用标准物质蓝宝石校正仪器在76.8～506.8℃区域内的仪器常数。应用DSC法测定了数种固体催化剂及其载体的比热值,并用杜邦公司提供的比热分析软件标绘比热-温度关系曲线。用该法测量J型催化剂平均比热为918J/kg·℃的重复性表明,标准偏差为12.14,相对标准偏差为1.3%。     

用国产CDR—1型差动热分析仪测定某些工程塑料的比热

介绍用国产CDR—l型差动热分析仪(DSC),标准样品为美国P—E公司出售的蓝宝石(Sapphire)和国产a—三氧化二铝(a—A1_2O_3),测定塑料比热的方法和实验原理。测定了聚碳酸酯(PC),聚苯乙烯(PS),有机玻璃(PMMA)以及丙烯腈-丁二烯-苯乙烯共聚物(ABS)等四种非晶态塑料和聚乙烯(PE),聚酰胺(PA),聚丙烯(PP)等三种结晶型塑料的比热。文中仅给出PC和PS的实验结果和讨论,其它几种塑料与此类似。最后用最小二乘法得出比热C_1与温度T之间的关系式。     

共聚合原理——第5章 共聚合参数测定及共聚物鉴定(四)

5.2.5 热分析鉴定方法 5.2.5.1 差示扫描量热法(DSC法) 1.对玻璃化温度T_g的测定。 对T_g,可借比容、比热、拆射率、弹性模量或介电常数等物理量与温度的依赖关系来测定。但总的说来,上述方法测定T_g时要花费大量的时间,而用DSC(differen-     

差示扫描量热法对PET热性能的研究

本文通过差示扫描量热仪及其他分析仪器相结合，分析了两个不同厂家的PET原料，通过改变DSC的实验条件确定了两种不同厂家PET原料的差别，样品B的结晶度较瓶用料样品的结晶度高，比瓶用料样品的耐热性强。文章分析了这种差别，指出这种差别不仅与样品的热历史有关，并且与其加工工艺及配料有关。通过多种仪器的联合测试，为厂家提供了以下信息：性能上的差异不是因为催化剂引起的，而是后期加工时的条件不同造成的。     

真空绝热量热计及航空燃料液态比热的测定

本文介绍了在-80～120℃温区内,精密测定各种液体物质比热的真空绝热型量热计。用标准物质正庚烷检测了量热装置的可靠性。用此装置测定了两种国产航空煤油在上述温区的比热。对实验装置的测量误差,进行数学分析,导出了比热测定的误差估计公式。     

喷气燃料冰点的差示扫描量热法测定

介绍差示扫描量热法(DSC)测定喷气燃料冰点的原理和实验过程。用DSC法测定了不同型号的8种喷气燃料的冰点,测定结果与国标法GB/T 2430-1981测定的一致。     

应用DSC测量HDPE熔体的热性能参数——Ⅱ.熔点与比热

应用差示扫描量热法(DSC)测量了几种高密度聚乙烯(HDPE)的熔点和热容变化,进而考察了试样的比热及其影响因素。     

DSC法测定醋酸-水溶液的比热

利用差示扫描热量计(DSC)测定了醋酸水溶液在温度范围为293.15~359.15K和整个组成范围下的比热,并把比热的测量值与文献值进行了比较, 实验的测量误差小于±2%, 测得的醋酸-水的比热数据完全能满足工程设计的需要。同时把醋酸-水的比热与组成与温度进行了关联,并利用最小二乘法回归出所提方程中的参数,最后导出了一个计算Cp的多项式方程,此方程中既包含温度又包含组成,因此利用此方程可以计算醋酸-水体系在测定温度和组成下的Cp。把用该方程的计算值与实验值进行了比较,117个数据点的总绝对平均相对误差为0.54%。所提方程可应用于对苯二甲酸生产中换热器的设计及相关体系热量平衡的计算,具有实用意义。     

浅析热分析技术在氟聚合生产中的应用

对热分析技术进行了概括和介绍,并针对常用的差示扫描量热法（DSC）与热重分析法（TGA）在聚合物及相关领域的应用展开论述,重点分析了DSC在熔点、比热容、玻璃化转变温度等方面以及TGA在失重分析、催化剂的组分确定等方面的应用。     

DSC法测定聚乙烯结晶度的研究

研究了用DSC法测定聚乙烯（PE）结晶度的理论和新方法，通过X射线衍射（WAXD）及常规DSC法对测得的不同PE的结晶度进行了对比，探讨了DSC技术对测定高聚物结晶度的合理性，通过调制式DSC（MDSC）对PE热容的研究，证明了在低温下存在着小晶片的熔融，进而能显著影响所测定的PE的结晶度，最后提出了由于PE结晶度的大小与环境温度密切相关，故用DSC技术测定其结晶度时，选择基线的温度范围具有重要意义。     

A Practical Method to Derive Sample Temperature during Nonisothermal Coupled Thermogravimetry Analysis and Differential Scanning Calorimetry Experiments

Nonisothermal thermogravimetry differential scanning calorimetry (TG‐DSC) mounting is intensively used for the determination of kinetic parameters and reaction heat along the chemical transformation of a solid. Nevertheless, when tests are performed with heating rates as high as those encountered in industrial processes, e.g., several tens of K min^–1, there is great uncertainty in the knowledge of the exact sample temperature. In this work, a method to derive a simple mathematical expression is proposed and fully described in order to calculate the real sample temperature throughout a temperature‐ramped test on a commercial apparatus. The furnace temperature and the heat flow signals were used, together with the crucible specific heat and the heating rate. A number of validation tests were performed to derive similar reaction rates for a reference. First‐order kinetic reactions were presented and reconciled over a large range of heating rates from 3 to 50 K min^–1.     

DSC法测定煤的比热

本文采用差示扫描量热仪（ＤＳＣ）对１４种含有不同挥发分的中国煤，在２０～１７０℃范围内测定了煤的比热，并校正为干燥无灰基煤的比热。结果表明，煤的比热随温度的变化和挥发分含量的不同而变化，依此建立了煤的比热和温度及挥发分含量的数学关联式。用此模型可以估计中国煤在２０～１７０℃范围内比热的值，其误差小于１０％。     

DSC法测定环氧树脂固化反应温度和反应热

介绍了差示扫描量热法（DSC）测试环氧树脂固化反应温度和反应热的原理和试验条件，研究了升温速率和样品量对测定结果的影响，对试验方法的不确定度进行了分析和评定，并进行了应用试验。结果表明，该方法对环氧树脂及其预浸料实施有效的质量控制具有重要的意义。     

溶胶-凝胶法制备P2O5-SiO2快质子导电玻璃

采用溶胶-凝胶法制备了P2O5-SiO2快质子导电玻璃,并借助DSC、XRD、FT-IR等测试手段分析了质子导电玻璃的热历史、微结构等,探讨了玻璃中磷含量、温度、OH基团对导电率的影响.     

Differential scanning calorimetry of mixtures of EVA and PE. Kinetic modeling

Mixtures of commercial EVA and different concentration of PE have been prepared and the heat evolution during two successive heating experiments has been studied by means of differential scanning calorimetry (DSC). A kinetic model has been suggested and applied, involving the different intrinsic fractions susceptible of undergoing transitions during the experiment, and also the concentration of PE in the initial binary mixture. Moreover, the variation of the apparent heat capacities of the different fractions and components with the temperature has been considered, yielding a remarkable improvement in the fitting of the DSC curves in the whole range of temperature studied. The models applied are capable of representing all the different processes observed and can be of great interest in the understanding of such phenomena, as well as in modeling the heat involved in the industrial processing of these types of products.     

U‐PVC gelation level assessment,part 2: Optimization of the differential scanning calorimetry technique

Differential scanning calorimetry (DSC) is one of the best techniques for assessing PVC gelation level. Thus, it is of great interest to understand and optimize the different aspects of the DSC method. In the present study, DSC experiments were carried out on PVC dryblend samples that were previously heat‐treated at different temperatures. Practical aspects such as sample preparation, heating rate, and ending temperature are described. Then, the obtained DSC patterns are compared and analyzed to clarify the origin of the measured events. The effects of PVC reprocessing on DSC patterns are presented, as well as the effects of heterogeneity issues (i) at the scale of a PVC window profile and (ii) at the scale of a PVC DSC sample. The method used for the determination of the gelation level is then analyzed. The choice of the integration limits that strongly affect the melting enthalpy values is discussed. Different ways of calculating the gelation level, including the conventional definition involving the ratio A/A + B as well as new approaches, are proposed. J. VINYL. ADDIT. TECHNOL. 12:108–114, 2006. © 2006 Society of Plastics Engineers.