CAJ | 학술논문

采用双管毛细筒流变仪研究反应降解聚丙烯（PP）的非线性流变性能及其与分子结构参数的关系。结果表明：降解PP熔体为假塑性流体，降解程度越大，剪切黏度越低，而非牛顿流动指数增大，表明低相对分子质量PP的黏-切敏感性降低；不同相对分子质量PP试样的黏度随温度升高而下降，相对而言，低相对分子质量PP的黏-温依赖性略大，可能与分子链变短后构象熵减小有关；降解PP熔体的毛细管入口压力降（熔体弹性）随相对分子质量减小而降低；低相对分子质量PP的入口压力降~剪切速率曲线规律性差，说明降解PP熔体在毛细管入口区的流动稳定性较差。
채용쌍관모세통류변의연구반응강해취병희（PP）적비선성류변성능급기여분자결구삼수적관계。결과표명：강해PP용체위가소성류체，강해정도월대，전절점도월저，이비우돈류동지수증대，표명저상대분자질량PP적점-절민감성강저；불동상대분자질량PP시양적점도수온도승고이하강，상대이언，저상대분자질량PP적점-온의뢰성략대，가능여분자련변단후구상적감소유관；강해PP용체적모세관입구압력강（용체탄성）수상대분자질량감소이강저；저상대분자질량PP적입구압력강~전절속솔곡선규률성차，설명강해PP용체재모세관입구구적류동은정성교차。
The non-linear rheological properties of polypropylene (PP) prepared by reactive extrusion degradation with different molecular structure parameters were studied by a double capillary rheometer. The results show that PP prepared by reactive extrusion degradation is pseudoplastic fluid. The shear viscosity of PP melts decreases with the degradation, but the non-Newtonian index increases, indicating the PP samples with lower relative molecular mass has low viscosity-shear sensitivity. The viscosity of the PP samples with different relative molecular mass decreases with the rise in the temperature. The viscous flow activation energy of the PP samples with lower relative molecular mass is slightly higher, which may be related to the lesser conformation entropy of shorter molecular chains. The inlet pressure drop (as characterization of melt elasticity) of the PP melts decreases with the degradation of PP, and moreover the curves of inlet pressure drop versus extrusion rate of the PP samples with lower relative molecular mass were irregular, which means that the PP melts flowing through the area of capillary entrance was unstable.