Incorporation of titanate nanosheets to enhance mechanical properties of water-soluble polyamic acid

Innovation in Polymer Science and Technology 2016

材料科学;化学

Harito, C.^1 ; Bavykin, Dmitry V.^1 ; Walsh, Frank C.^1

Faculty of Engineering and the Environment, University of Southampton, Southampton

SO17 1BJ, United Kingdom^1

关键词: Colloidal dispersion;    Filler loading;    Oxydianiline;    Polyamic acids;    Pure polymers;    Reinforcing fillers;    Titanate nanosheets;    Triethylamines;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/223/1/012054/pdf
DOI  :  10.1088/1757-899X/223/1/012054

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Pyromeliticdianhydride (PMDA) and 4',4'-oxydianiline (ODA) were used as monomers of polyimide. To synthesise a water soluble polyimide precursor (polyamic acid salt), triethylamine (TEA) was added to polyamic acid with a TEA/COOH mole ratio of 1:1. Titanate nanosheets were synthesised by solid-state reaction, ion-exchanged with acid, and exfoliated by TEA. Exfoliated titanate nanosheets were mixed with water soluble polyamic acid salt as reinforcing filler. Drop casting was deployed to synthesise polyamic acid/titanate nanosheet nanocomposite films. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to study the morphology and dispersion of nanosheets in the colloidal dispersion and the solid film composite. Modulus and hardness of nanocomposites was provided by nanoindentation. Hardness increased by 90% with addition of 2% TiNS while modulus increased by 103% compared to pure polymer. This behaviour agrees well with Halpin-Tsai theoretical predictions up to 2 wt% filler loading; agglomeration occurs at higher concentrations.