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Al Munsur, Abu Zafar,Hossain, Iqubal,Nam, Sang Yong,Chae, Ji Eon,Kim, Tae-Hyun Elsevier 2020 Journal of membrane science Vol.599 No.-
<P><B>Abstract</B></P> <P>Poly(styrene-<I>b</I>-ethylene-<I>co</I>-butylene-<I>b</I>-styrene) (SEBS) triblock copolymers are prepared with 50% hexyl quaternary ammonium (HQA) and 20% alkyl chains of different chain lengths: C<SUB>4</SUB> (50HQA-20C<SUB>4</SUB>-SEBS) and C<SUB>12</SUB> (50HQA-20C<SUB>12</SUB>-SEBS). Their physicochemical and electrical properties are investigated for use as novel alkaline anion exchange membranes. In most other comb-type polymers, the alkyl chain is introduced as a hydrophilic spacer unit between the polymer backbone and conducting head group. In the current study, additional alkyl chains are grafted onto the SEBS polymer as hydrophobic side chains as well as typical hydrophilic side chains. Introduction of this extra hydrophobic alkyl spacer group is done to obtain well-connected morphology, increased free volume, enhanced water uptake and related conductivity, together with improved physicochemical properties of the membranes obtained. The results are compared with HQA-functionalized SEBS without the hydrophobic alkyl spacer group (50HQA-20C<SUB>0</SUB>-SEBS), and the effects of the alkyl chain lengths on the structure of polymers and physicochemical properties of the corresponding membranes are investigated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrophobic-hydrophilic comb-type polymers were prepared. </LI> <LI> Long hydrophobic side chain provided increased free volume. </LI> <LI> Hydrophobic side chain induced well-separated morphology. </LI> <LI> High conductivity and chemophysical properties were obtained. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
다양한 사슬 길이를 갖는 SEBS 공중합체 기반의 음이온 교환막
Abu Zafar Al Munsur,김태현 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.05
There is a great importance in the development of anion exchange membrane fuel cells (AEMFCs) for renewable energy research. The high conductivity and alkaline stability under high pH conditions at elevated temperatures are required for AEMs. We report herein SEBS-based AEMS with different hydrophobic side chain lengths, and investigated the properties of the corresponding AEMs, including conductivity, morphology and chemophysical stabilities.
Roy, Harendra Nath,Rana, Masud,Munsur, Abu Zafar Al,Lee, Kee-In,Sarker, Ashis K. Informa UK (TaylorFrancis) 2016 Synthetic communications Vol.46 No.16
<P>An efficient, four-component, one-pot condensation reaction of phthalimide or phthalic anhydride, aromatic aldehydes, and ethyl cyanoacetate for the synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives mediated by L-proline in excellent yields is reported. [GRAPHICS] .</P>
Lim, Haeryang,Lee, Boryeon,Yun, Dayoung,Al Munsur, Abu Zafar,Chae, Ji Eon,Lee, So Young,Kim, Hyoung-Juhn,Nam, Sang Yong,Park, Chi Hoon,Kim, Tae-Hyun American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.48
<P>Poly(2,6-dimethyl-1,4-phenylene oxide)s (PPOs)-based anion exchange membranes (AEMs) with four of the most widely investigated head groups were prepared. Through a combination of experimental and simulation approaches, the effects of the different types of head groups on the properties of the AEMs, including hydroxide conductivity, water content, physicochemical stability, and fuel cell device performance were fully explored. Unlike other studies, in which the conductivity was mostly investigated in liquid water, the conductivity of the PPO-based AEMs in 95% relative humidity (RH) conditions as well as in liquid water was investigated. The conductivity trend in 95% RH condition was different from that in liquid water but corresponded well with the actual cell performance trend observed, suggesting that the AEM fuel cell performance under in situ cell conditions (95% RH, 60 °C, H<SUB>2</SUB>/O<SUB>2</SUB>) is more closely related to the conductivity measured ex situ under 95% RH conditions (60 °C) than in liquid water. On the basis of the conductivity data and molecular simulation results, it was concluded that the predominant hydroxide ion-conducting mechanism in liquid water differs from that in the operating fuel cell environment, where the ionomers become hydrated only as a result of water vapor transported into the cells.</P> [FIG OMISSION]</BR>
Roy, Harendra Nath,Rana, Masud,Munsur, Abu Zafar Al,Lee, Kee‐,In,Sarker, Ashis K. WILEY‐VCH Verlag 2016 Chem Inform Vol.47 No.52
<P><B>Abstract</B></P><P>An environmentally friendly, four‐component, one‐pot condensation reaction of phthalimide or phthalic anhydride, various aromatic aldehydes, ethylcyanoacetate, and hydrazine hydrate is presented.</P>