【作者】 赵洋；

【导师】 王克俭；

【作者基本信息】 北京化工大学 ， 材料科学与工程， 2012， 硕士

【摘要】 聚合物压力-比容-温度（P-V-T）关系直接影响着聚合物的生产、加工以及应用，掌握其基本规律并发展可工程化应用的检测技术十分重要。常规检测方法难以应用于工程实际，发展方便适用的无损在线检测方法前景广阔。本文应用超声波检测方法表征聚合物PVT，基于定量理论推导和实验数据拟合的分析建立了具体表征方法。本文在稳态条件下同步测量聚合物PVT数据与超声波信号数据，通过分析实验数据，归纳了聚合物比容与超声波声速之间的定量关系；联系聚合物状态方程理论，应用Tait经验方程、Flory-Orwoll-Vrij自由体积模型（FOV方程）、Prigogine方阱胞腔模型（CM方程）、Dee-Walsh修正胞腔模型（MCM方程）、Sanchez-Lacombe格子流体模型（SL方程）和Hartmann-Haque模型（HH方程）等6个状态方程研究了共混组分与填充份数对状态方程参数的影响。（1）以结晶聚合物高密度聚乙烯（HDPE）为例分析了聚合物PVT曲线与超声波信号曲线之间的关系，结果表明PVT曲线的突变与超声波振幅的极值和超声波声速的突变相对应，同时接近DSC曲线的吸热峰峰值T_m，此外，对比聚合物PVT曲线和超声波声速曲线发现二者相似，因此可由超声波声速来定量描述聚合物比容。同时，其它单组份聚合物（PP、PS）和聚合物共混体系（PP/HDPE）及聚合物填充体系（PP/CaCO₃）也具有类似的性质。（2）对实验数据进行数值拟合，获得了三类材料体系状态方程的参数；分析了聚合物共混体系组成和聚合物填充体系填充份数对其传递超声波信号以及状态方程参数的影响，结果也显示出一定的规律性；超声波信号以及状态方程参数均可以定性描述聚合物共混体系的相容性。（3）通过对实验数据的分析得到了5组定量描述三类材料体系超声波声速与聚合物比容的关系式。比较5个方程（组）发现方程V=c^-1/3.F^-7/6很好的适用于各类材料体系，并且F值与填充份数呈现线性变化。更多还原

【Abstract】 Pressure, volume and temperature （P-V-T） has a direct impact on theproduction, processing and application of polymers. It is very significantto understand the basic rules and to develop the on-line detection wayswhich can be used in industry. Conventional methods are difficult to beapplied to actual projects, non-destructive online detection exhibits broadprospects. In this paper, ultrasonic testing method was used tocharacterize polymer PVT. Specific characterization methods wereobtained on quantitative models and experimental data-fitted relations.In this article, the polymer PVT data and the ultrasonic signal dataare simultaneously measured under steady state conditions. Thequantitative relationship between specific volume and ultrasonic velocityare summarized after analyzing the experimental data. Through Taitempirical equation, the Flory-Orwoll-Vrij model （FOV equation）,Prigogine "square well" cell model （CM equation）, Dee and Walsh modified cell model （MCM equations）, Sanchez-Lacombe lattice-fluidmodel （SL equation）, and the Hartmann-Haque model （HH equations）,the effects of polymer structure, blend component and filler content onthe transferred ultrasonic signals and parameters’ value state equation.（1） Crystalline high-density polyethylene （HDPE） was used as anexample to analyze the relationship between polymer PVT and ultrasonicsignals. It was shown that transition temperature of PVT curvecorresponds with the extreme values of ultrasonic amplitude and velocitywhich is close to the endothermic peak （T_m） of its DSC curve. The shapeof specific volume curve is similar to that of ultrasonic velocity curveillustrating that the latter can quantatively describe specific volume.This fact is also fitful to polymer blends （PP/HDPE） and polymer-filledsystem （PP/CaCO₃）.（2） The parameter’s values of state equation were calculated for thethree types of material systems by numerical fitting experimental data.The influences of composition for polymer blends and that of fillercontent for polymer-filled system on the ultrasonic signals and theequation of state parameters were analyzed showing certain regularity.Both of ultrasonic signal and the equation of state parameters can wellreflect the compatibility of polymer blends.（3） Five sets of equations were developed to quantitatively describethe relations between ultrasonic velocity and specific volume for three types of complex polymer materials. Their comparison told thatV=c^-1/3.F^-7/6 is applicable to all materials when F-value varies linearlywith filler content.更多还原