共混改性提高奇-奇数尼龙1111的压电与铁电性能

Improving piezoelectricity and ferroelectricity in odd-oddnylon 1111 by blending

压电与铁电聚合物在换能器、驱动器与传感器中应用广泛,但是铁电聚合物种类稀少,而尼龙类铁电聚合物具有廉价、绿色以及高温稳定的特点,有潜在的应用价值。奇-奇数尼龙1111(PA1111)是一种新型铁电与压电聚合物材料,但其电活性偏低,限制了它的应用。通过与聚偏氟乙烯(PVDF)共混改性进一步提高了PA1111的电活性。研究表明,添加40%PVDF的尼龙1111拉伸薄膜压电应变常数(d33)提高到-6.9 pC/N,剩余极化强度(Pr)增加到52 mC/m^2。共混改性后PA1111铁电与压电性能的提高可以归因于PA1111与PVDF偶极子间的相互作用。

Piezoelectric and ferroelectric polymers have been widely used in sensors and actuators.Nylon ferroelectric polymer is cheap,green and stable at high temperature,so it has potential application value.Odd-odd nylon 11,11 is a new ferroelectric and piezoelectric polymer material.However,its low electroactivity limits its application.The electroactivity of PA1111 was further improved by blending with polyvinylidene fluoride(PVDF).The results shows that the piezoelectric strain coefficient,d33,was increased to-6.9 pC/N and the remament polarization,Pr,was increased to 52 mC/m^2 for the stretched film of nylon 11,11 with 40%PVDF.The improved ferroelectric and piezoelectric properties after blending modification could be attributed to the dipolar intermolecular interactions between PA1111 and PVDF.