Preparation of Polyimide/MWCNT Nanocomposites via Solid State Shearing Pulverization (S3P) Processing.
Polyimide/multiwall carbon nanotube (PI/MWCNT) nanocomposite films with homogeneous MWCNTs dispersion were prepared via a solid state shearing pulverization (S3P) approach. Polyimide precursor, viz., poly(amic acid) (PAA), was synthesized from 4,4'-oxydianiline (ODA) and pyromellitic dianhydride (PMDA). Then, 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) was mixed with the PAA powder and acid functionalized MWCNTs (acid-MWCNTs) by solid state shearing pulverization (S3P) approach. Finally, PI/MWCNT nanocomposite films were prepared by thermal imidization at elevated temperatures. Using such an approach not only the MWCNTs are well-dispersed but also the mechanical and thermal properties of PI are improved. The tensile strength of PI was enhanced by 74% and the elongation at break decreased to 10.35% with 5.0 wt% acid- MWCNT loading. And the glass transition temperature of PI was increased to 341 degrees C from 303 degrees C because of the strong interfacial bonding between PI and acid-MWCNTs. The solid state shearing pulverization (S3P) approach developed in this study provides a novel method to prepare various polymer composites with desired particle dispersion.
Ruojin
R
Liu
Fenghua
F
Zhao
Huanhuan
H
Zhang
Xiaoyan
X
Yu
Huili
H
Ding
Kimiyoshi
K
Naito
Xiongwei
X
Qu
Qingxin
Q
Zhang
D053761:Nanocomposites / Q000737:chemistry*; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013718:Tensile Strength
D037742:Nanotubes, Carbon; D011108:Polymers