含硅芳炔树脂及其共混物熔体的流变性能

Rheological Properties of the Molten Silicon-Containing Arylacetylene Resin and Its Blends

采用旋转黏度计和流变仪考察了含硅芳炔树脂（PSA）和含炔丙基苯并噁嗪（P-BZ）共混改性PSA树脂熔体的流变行为,建立了树脂黏度-组分-温度的数学模型。结果表明,P-BZ共混改性PSA树脂可使树脂的加工窗口变宽,树脂在90--130℃的黏度随温度升高而下降,PSA树脂的熔体黏度随P-BZ的加入而降低,P-BZ的加入提高了PSA树脂的加工适用性;PSA树脂的黏度可通过加入P-BZ和升高加工温度进行预测和调控。PSA及其改性树脂的动态流变行为显示树脂熔体呈牛顿流体,P-BZ降低了PSA树脂熔体的储能模量和复数黏度。用双阿仑尼乌斯方程对PSA及其改性树脂在160--190℃的等温黏时曲线进行拟合,得到的经验模型表明当PSA树脂共混入质量分数为10%的P-BZ时,树脂的凝胶时间延长,而树脂凝胶固化活化能从84.50kJ/mol降至54.83kJ/mol。

The rotary viscometer and rheometer were used to study the rheological behaviors of the silicon-containing arylacetylene resin （PSA） and the blended resin with propargyl-containing benzoxazine （P-BZ）. The mathematical model of viscosity-composition-temperature of the resins was established. The results show that the processing window of PSA resin is enlarged by blending with P-BZ. The viscosity of the molten PSA reduced with addition of P-BZ and increasing temperature in the range of 90--130 ℃. The processing applicability of PSA was enhanced by blending with P-BZ. The viscosity of the molten PSA resin can be predicted and modulated by the mass fraction of P-BZ and processing temperature. The rheological properties of the molten PSA and its blends behave as a Newtonian flow. The storage modulus and complex viscosity of the molten PSA resin decreased with addition of P-BZ. The dual Arrhenius equation was used to fit the isothermal viscosity-time variation of the molten PSA and its blends in 160-- 190 ℃. The deduced experiential models indicate that the gel time of PSA is prolonged and the gel activation energy of PSA reduce from 84.50 kJ/mol to 54.83 kJ/mol when 10% mass fraction of P-BZ are added.