TY  - JOUR
PB  - Universiti Malaysia Pahang
SN  - 22894659
EP  - 3151
AV  - none
TI  - Synthesis of high molecular weight polyimide consisting hexafluoroisopropylidene moiety for gas separation
SP  - 3144
N1  - cited By 3
Y1  - 2017///
VL  - 11
A1  - Mokri, N.A.
A1  - Oh, P.C.
A1  - Mukhtar, H.
A1  - Chew, T.L.
JF  - Journal of Mechanical Engineering and Sciences
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042692939&doi=10.15282%2fjmes.11.4.2017.17.0283&partnerID=40&md5=4d78611f07c929ad53a48780ae9ed122
ID  - scholars8081
N2  - In this work, high molecular weight of heterocyclic aromatic polyimide consisting hexafluoroisopropylidene moiety in both diamine and dianhydride fragments was synthesised. The synthesis was performed via a two-step polycondensation route, which involved polyamic acid formation and chemical imidization. Subsequently, physical purification technique was conducted by microfiltration and re-crystallisation to obtain oligomers-free high molecular weight polymer. Selections of high purity and suitable solvent, type of amine catalyst, precipitation medium and reaction temperature were considered to favour the formation of high molecular weight polyimide. The synthesised polyimide was characterised by ATR-FTIR, which confirmed the presence of significant imide bands denoting the formation of imide linkage. Further confirmation of polyimide molecular structure was accomplished using 13C and 1H NMR. It was found that polyimide with high molecular weight (4500 KDa) was obtained with a polydispersity index of 1.48. Therefore, this polymer has favourable properties for gas separation membrane application. © Universiti Malaysia Pahang, Malaysia
IS  - 4
ER  -