상세 정보

underline
Metadata Downloads : dc(xml) or Excel
Cited 0 time in scopus ci

Title 

Soluble and transparent polyimides from unsymmetrical diamine containing two trifluoromethyl groups

Authors 

S D KimS Y KimIm Sik Chung

Publisher 

Wiley-Blackwell

Issue Date 

2013

Citation 

Journal of Polymer Science Part A: Polymer Chemistry, vol. 51, no. 20, pp. 4413-4422

Keywords 

filmshigh performance polymerspolyimidestrifluoromethyl groups

Abstract 

A new unsymmetrical diamine monomer containing two trifluoromethyl (CF 3) groups is prepared from 2-bromo-5-nitro-1,3-bis(trifluoromethyl) benzene. The monomer is polymerized with typical dianhydrides, in this case PMDA, BPDA, BTDA, ODPA, and 6-FDA, using a one-pot synthetic method to obtain corresponding polyimides. All of the prepared polyimides are readily soluble in many organic solvents and can be solution-cast into transparent, flexible, and tough films. These films have a UV-vis absorption cut-off wavelength at 340-375 nm and light transparencies of 87-91% at a wavelength of 550 nm. Incorporation of two CF3 groups unsymmetrically into rigid polyimides improves their solubility and transparencies without decreasing their physical properties. The polymers exhibit high thermal stability with 5% weight loss at temperatures ranging from 534 to 593 °C in nitrogen and from 519 to 568 °C in air, and high glass transition temperatures (Tg) above > 300 °C depending on their molecular structures. They also have a coefficient of thermal expansion (CTE) value of 46-69 ppm/°C. In addition, they show low refractive indices in the range of 1.535-1.602 at a wavelength of 633 nm due to the unsymmetrical incorporation effect of the two CF3 groups.

ISSN 

0887-624X

Link 

http://dx.doi.org/10.1002/pola.26855

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


There are no files associated with this item.
qrcode

FusionCharts.
DSpace Software Coptright(c) 2010 MIT and Hewleft-Packard  /  KRIBB-REPOSITORY ( Email:jakim@kribb.re.kr)