摘要
不同形状填料对热塑性聚酯弹性体(TPEE)复合材料产生不同的的流变响应。为了研究填料形状对TPEE的流变响应,本研究对TPEE分别填充球状重质碳酸钙(CaCO_(3))和片层滑石粉熔融共混制备了不同填料形状的TPEE复合材料,并用毛细管剪切流变方法研究了填料形状对TPEE剪切流变、圆形流道流动行为与挤出胀大等流变特性的影响。结果表明,相比于填充球状重质CaCO_(3),片层滑石粉填充TPEE的复合体系剪切应力(或剪切黏度)更大,幂律指数(n)更小,假塑性非牛顿流体特征更明显,壁面滑移速率与在流道中的熔体流动速率更大,“柱塞流”流动行为更明显,熔体表观黏流活化能(E_(a))与挤出胀大比更小;球状重质CaCO_(3)/TPEE和片层滑石粉/TPEE复合材料的E_(a)均随剪切速率增大而减小。
Different shaped fillers exhibit different rheological responses to thermoplastic polyester elastomers(TPEE)composites.To study the rheological responses of filler shapes to TPEE,the TPEE composites with different filler shapes were prepared by adding the spherical heavy calcium carbonate(CaCO_(3))or lamellar talc powder to the TPEE matrix and the melt blending method.The effects of filler shapes on the shear rheology,circular channel flow behavior and die swelling of TPEE were studied by the capillary shear rheology method.The results show that,compared with the composites with spherical heavy CaCO_(3),the TPEE composites with lamellar talc powder have higher shear stress(or shear viscosity),smaller power-law exponent(n),more obvious pseudo plastic non-Newtonian fluid characteristics,higher wall slip rate,higher melt flow rate in the circular channel,more obvious“plug flow”behavior,smaller apparent viscous flow activation energy(E_(a)),and smaller die swelling ratio.The E_(a) of spherical heavy CaCO_(3)/TPEE_(a)nd lamellar talc powder/TPEE composites decrease with the increase of shear rate.
作者
孙刚伟
李尚清
SUN Gangwei;LI Shangqing(Orinko Advanced Plastics(Shanghai)Co.,Ltd.,Shanghai 200062,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2024年第10期89-95,共7页
China Plastics Industry
关键词
热塑性聚酯弹性体
填料形状
流变行为
黏弹活化能
挤出胀大
Thermoplastic Polyester Elastomer
Filer Shape
Rheological Behavior
Viscoelastic Activation Energy
Die Swelling
作者简介
孙刚伟,男,1983年生,博士,高级工程师,主要从事高分子材料改性和应用开发工作。sungw@orinko.com.cn;通信作者:李尚清,男,1992年生,博士,工程师,主要从事热塑性弹性体改性工作。lisq@orinko.com.cn。
