Structuredsearch

Cao Li

Find an error

Name: 李曹; Li, Cao
Organization: Sichuan University , China
Department: College of Polymer Engineering and Science
Title: Associate Professor(PhD)

TOPICS

Compatibility, rheological, and thermal properties of the melt blends of PEN (HQ/PP) with PEN (HQ/RS)
Co-reporter:Cao Li;Nian Gao;Xiaobo Liu
Journal of Applied Polymer Science 2008 Volume 108( Issue 5) pp:2934-2939
Publication Date(Web):
DOI:10.1002/app.27790

Abstract

Two kinds of polyarylene ether nitriles (PEN) copolymers PEN (HQ/PP) and PEN (HQ/RS) were synthesized using 2,6-dicholorobenzonitrile (DCBN) with equal molar of phenolphthalein (PP) and hydroquinone (HQ), DCBN with equal molar of HQ and resorcin (RS), respectively. The melt-mixed blends of two PENs over the complete composition range were characterized by dynamic mechanical analyses (DMA), tensile testing, scanning electronic microscopy (SEM), and capillary rheometer test for their compatibility, thermal, mechanical, and melt flow properties study. DMA show a considerable compatibility between the two PENs. Morphology examinations reveal good component dispersion and strong interface adhesion. The capillary rheometer test found that the blending of PEN (HQ/RS) enhanced the fluidity of the PEN (HQ/PP)/PEN (HQ/RS) blends by reducing its viscosity, which is beneficial to the processability of PEN (HQ/PP). © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

Preparation and characterization of poly(arylene ether nitriles)/glass fibers/BaTiO3 ternary composites
Co-reporter:Cao Li, Xianwen Liu, Nian Gao, Xiaobo Liu
Materials Letters 2008 Volume 62(Issue 2) pp:194-197
Publication Date(Web):31 January 2008
DOI:10.1016/j.matlet.2007.05.001
Poly(arylene ether nitriles) (PEN) copolymers PEN (HQ/RS) was synthesized using 2,6-dicholorobenzonitrile (DCBN) with equal molar of hydroquinone (HQ) and resorcin (RS). Composites of PEN reinforced by glass fiber (GF) and nanometer-sized BaTiO3 particle were prepared through melt blending. Both mechanical and thermal properties of the composites were found improved with the increase of GF as well as BaTiO3 contents. For PEN/GF/BaTiO3 ternary composites, the best mechanical properties were found when the content for GF and BaTiO3 is 8 wt.% and 22 wt.%, respectively. The fractured surfaces of PEN/BaTiO3 composites were examined with SEM and show a characteristic of ductile fracture. The heat distortion temperature (HDT) of 35 wt.% GF reinforced composite is 241 °C, nearly an increase ca. 100 °C compared to that of the pristine resin.
Mechanical and thermal properties study of glass fiber reinforced polyarylene ether nitriles
Co-reporter:Cao Li, Xiaobo Liu
Materials Letters 2007 Volume 61(11–12) pp:2239-2242
Publication Date(Web):May 2007
DOI:10.1016/j.matlet.2006.08.055
Glass fiber (GF) reinforced phenolphthalein-based polyarylene ether nitrile composites were prepared through melt blending, and the composites were characterized by various methods to find that both the mechanical and thermal properties of the silane coupling agent treated GF reinforced composites were improved with the increase of GF content. Tensile strength, flexural strength and Izod impact strength got their highest values with GF content at 35 wt.%, 30 wt.% and 25 wt.% respectively. The heat distortion temperature (HDT) of 30 wt.% GF reinforced composite is 284 °C, more than a 100 °C increase compared to the pristine resin.
Synthesis and properties of phenolphthalein-based polyarylene ether nitrile copolymers
Co-reporter:Cao Li, Yi Gu, Xiaobo Liu
Materials Letters 2006 Volume 60(Issue 1) pp:137-141
Publication Date(Web):January 2006
DOI:10.1016/j.matlet.2005.08.004
Phenolphthalein-modified polyarylene ether nitrile copolymers were synthesized by nucleophilic substitution reaction of 2,6-difluorobenzonitrile (DFBN) with varying molar ratios of phenolphthalein (PP) and hydroquinone (HQ). The copolymers were chemically and physically characterized to have good thermal and mechanical properties. PP content of the copolymers has influence on glass transition temperature (Tg) as well as decomposition temperature (Tid). Coats–Redfern method was applied to study the thermal decomposition kinetics of the copolymers to predict the lifespan under thermal aging process of the copolymers, the results show that the lifespan increases with increasing PP content.