1P-516 고농도 용액에서 Poly-m-phenylene terephthal amide(PMTA) 협성과 그 특성에 관한 연구

최필준,이재연,고재완,서석훈 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.0

Synthesis of well-defined rod-coil block copolymers containing trifluoromethylated poly(phenylene oxide)s by chain-growth condensation polymerization and atom transfer radical polymerization

Kim, Yun Jun,Seo, Myungeun,Kim, Sang Youl Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of polymer science Part A, Polymer chemist Vol.48 No.5

<P>Well-defined trifluoromethylated poly(phenylene oxide)s were synthesized via nucleophilic aromatic substitution (S<SUB>N</SUB>Ar) reaction by a chain-growth polymerization manner. Polymerization of potassium 4-fluoro-3-(trifluoromethyl)phenolate in the presence of an appropriate initiator yielded polymers with molecular weights of ∼4000 and polydispersity indices of <1.2, which were characterized by <SUP>1</SUP>H nuclear magnetic resonance spectroscopy and gel permeation chromatography. Initiating sites for atom transfer radical polymerization (ATRP) were introduced at the either side of chain ends of the poly(phenylene oxide), and used for ATRP of styrene and methyl methacrylate, yielding well-defined rod-coil block copolymers. Differential scanning calorimetry study indicated that the well-defined trifluoromethylated poly(phenylene oxide)s showed high crystallinity and were immiscible with polystyrene. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 1049–1057, 2010</P> <B>Graphic Abstract</B> <P>Well-defined trifluoromethylated poly(phenylene oxide)s were synthesized via nucleophilic aromatic substitution (S<SUB>N</SUB>Ar) reaction by a chain-growth polymerization manner. Synthesized poly(phenylene oxide)s were converted into macroinitiators for atom transfer radical polymerization (ATRP) and synthesis of well-defined rod-coil block copolymers was demonstrated via ATRP in the presence of the poly(phenylene oxide) macroinitiators. <img src='wiley_img/0887624X-2010-48-5-POLA23859-gra001.gif' alt='wiley_img/0887624X-2010-48-5-POLA23859-gra001'> </P>

말단이 아미노기로 된 Poly(m-phenylene isophthalamide) 및 Poly(2-cyano-1,4-phenylene terephthalamide) 텔레킬릭스의 합성 및 특성분석

오태진,신동일 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.10

Difunctional amino-terminated poly(m-phenylene isophthalamide)(AT-PMIA) and poly(2-cyano-1,4-phenylene terephthalamide)(AT-CyPPDT) telechelics were prepared by low temperature solution polymerization of isophthaloyl chloried (IPC) and terephthaloyl chloride(TPC) with calculated excess amounts of m-phenylenediamine(MPD) and 2-cyano-1,4-phenylenediamine(CyPPD) in dimethylacetamide(DMAc) and N-methyl-2-pyrrolidone(NMP), respectively. Purity of amino groups of the telechelics was determined by measuring the molar extinction coefficient(${\varepsilon}_{\lambda}{max}$) of a protonated bis-Schiff base which was formed from the reaction of 4-(dimethylamino) benzaldehyde(DMBA) with diamines in the presence of p-toluenesulfonic acid(TA) in dimethylacetamide(DMAc) containing 2%(wt.) LiCl; the number average moles of amino groups in the telechelics was calculated from their $M_{n}$ using the Mark-Houwink equations for carboxy-terminated PMIA(CT-PMIA) and CyPPDT(CT-CyPPET), i.e., [η]=7.96${\times}$$10^{-4}M_{n}^{0.71}$ and [η]=2.51${\times}$$10^{-4}M_{n}^{1.02}$, respectively. It decreased as reactant mole ratio (${\gamma}$) approached 1.0. It increased, however, as expected on reaction with further excess diamine after the polymerization reaction. Reactivity of amino groups of the telechelics was confirmed by change in intrinsic viscosity([η]) and numberaverage molecular weight($M_{n}$) with the coupling reaction of IPC and TPC.

Poly(phenylene sulfide)/Poly(ethylene terephthalate) 블렌드의 제조 및 특성 분석

배꽃하얀,함명조,김영호,Bae, Ggot-Ha-Yan,Ham, Myong-Jo,Kim, Young-Ho 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.5

A melt blending method was used to blend poly(ethylene terephthalate) (PET) and poly(phenylene sulfide) (PPS) with a twin screw extruder to provide basic data for the production of PPS/PET sheath-core type bicomponent fibers. Differential scanning calorimetry showed that the melting ($T_m$) and glass transition temperature ($T_g$) of PPS in the PPS/PET blends were unaffected by the addition of PET, even up to 20 wt%. However, PET addition resulted in a decrease in the cold crystallization temperature ($T_{cc}$) of PPS and an increase in the melt crystallization temperature ($T_{mc}$) of PPS. SEM images of the fracture surface of the PPS/PET blends with various compositions showed that the PET appeared as spherical particles in the blends. This shows that PPS/PET is an immiscible blend system. The addition of up to 20 wt% PET did not affect the mechanical properties of the resulting PPS/PET films. The tensile strength retention of the blend films immersed in an aqueous solution containing either 30% NaOH, 10% HCl or 10% $HNO_3$ at $93^{\circ}C$ for one week was unaffected by PET blending.

Synthesis of colorless and highly refractive Poly(phenylene thioether ether) derived from 2,7-(4,4′-diphenol)thiothianthrene

Oh, Nuri,Nam, Ki-Ho,Goh, Munju,Ku, Bon-Cheol,Kim, Jeung Gon,You, Nam-Ho Butterworth Scientific Ltd. etc. 2019 Polymer Vol.165 No.-

<P><B>Abstract</B></P> <P>Totally colorless, transparent, and highly refractive poly(phenylene thioether ether)s (PPTEs) containing thianthrene-2,7-disulfanyl moiety were developed in this study. A new 4,4′-diol aromatic compound, 2,7-(4,4′-diphenol)thiothianthrene (DPTT), with a high sulfur content was designed and synthesized to develop polymers with high refractive indices and high thermal stabilities. The PPTEs were prepared by polycondensation of DPTT with organic dihalogen compounds, such as 2,6-difluorobenzonitrile (DFBN) and 4,6-dichloro-2-(methylthio)pyrimidine (DCMP). The obtained polymers showed good thermal stabilities such as relatively high glass transition temperatures (<I>T</I> <SUB>g</SUB>s) in the range of 153–176 °C and 5% weight loss temperatures (<I>T</I> <SUB>5%</SUB>) over 344 °C. The cut-off wavelengths (<I>λ</I> <SUB>0</SUB>) of the PPTE films are shorter than 343 nm, and they have a transmittance higher than 93% at 550 nm. The combination of the pyrimidine and high sulfur-containing thianthrene derivatives provides the PPTEs with a high refractive index of 1.7204 and a small birefringence of 0.0106 at 637 nm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Colorless, transparent, and highly refractive poly(phenylene thioether ether)s was prepared by polycondensation reaction. </LI> <LI> The polymer films exhibited a refractive index of in the range of 1.7188–1.7204 with low birefringence values. </LI> <LI> The poly(phenylene thioether ether)s showed a high thermal stability (>360 °C). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This paper represent synthesis and characterization of highly refractive and transparent poly(phenylene thioether ether)s (PPTEs) containing thianthrene-2,7-disulfanyl moiety in the polymer chains. The PPTEs were prepared by polycondensation of DPTT with organic dihalogen compounds, such as 2,6-difluorobenzonitrile (DFBN) and 4,6-dichloro-2-(methylthio)pyrimidine (DCMP). The polymer exhibited high refractive indices in the range of 1.7188–1.7204 with low birefringence values in the range of 0.0114–0.0106 and a high thermal stability (>360 °C) and optical transparency.</P> <P>[DISPLAY OMISSION]</P>

Synthesis and characterization of new blue-light-emitting polymers based on PPP and PPV having fluorene pendant at vinyl bridge

Kim, Yun-Hi,Jung, Sang-Yun,Jung, Sung Ouk,Park, Moon-Hak,Kwon, Soon-Ki Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of polymer science Part A, Polymer chemist Vol.44 No.16

<P>The new poly(arylene vinylene) derivatives, which are composed of biphenylene vinylene phenylene vinylene, biphenylene vinylene m-phenylene vinylene, terphenylene vinylene phenylene vinylene, and terphenylene vinylene m-phenylene vinylene as backbone and bulky fluorene pendants at each vinyl bridge, were designed, synthesized, and characterized. The obtained polymers showed weight-average molecular weights of 11,100–39,800 with polydispersity indexes ranging from 1.5 to 2.1. The resulting polymers were amorphous with high thermal stability and readily soluble in common organic solvents. The obtained polymers showed blue emission (λ<SUB>max</SUB> = 456–475 nm) in PL spectra, and polymer 4 containing terphenylene vinylene m-phenylene vinylene showed the most blue shifted blue emission (λ<SUB>max</SUB> = 456 nm). The double layer light-emitting diode devices fabricated by using obtained polymers as emitter emitted bright blue light. The device showed turn on voltage around 6.5 V and brightness of 70–250 cd/m<SUP>2</SUP>. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 4923–4931, 2006</P> <B>Graphic Abstract</B> <P>The new poly(arylene vinylene) derivatives, which are composed of biphenylene vinylene phenylene vinylene, biphenylene vinylene m-phenylene vinylene, terphenylene vinylene phenylene vinylene, and terphenylene vinylene m-phenylene vinylene as backbone and bulky fluorene pendants at each vinyl bridge, were designed and synthesized by the Suzuki coupling and nickel(0)-mediated polycoupling. <img src='wiley_img/0887624X-2006-44-16-POLA21579-gra001.gif' alt='wiley_img/0887624X-2006-44-16-POLA21579-gra001'> </P>

Synthesis and investigation of Poly(p-phenylene) based Multi-block Anion Exchange Materials (AEMs) with chain extender for Anion Exchange Membrane Fuel Cell

차민석,한승희,오성근,홍영택,이장용 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

Anion exchange membranes (AEM) have been considered as one of the promising electrolytes for anion exchange membrane fuel cell (AEMFC). To realize high-performance for AEMFC, anion exchange membrane (AEM) required that excellent stability and high ion conductivity. Herein,we have synthesized aromatic multiblock copolymers consisting of poly(p-phenylene) blocks combined with hydrophobic poly(arylene ether sulfone) blocks using chain extender group for improve molecular weight which affecting the stability and performance of AEM. A series of multi-block poly(p-phenylene)s containing a quaternary ammonium group were synthesized by Ni(0)-catalyzed coupling reaction, benzylic bromination and in-situ quaternization, successively. In particular, we measured the chemical, mechanical stability and AEMFC performance of poly(p-phenylene) based ionomer.

New Evaluation Methods of Average Molecular Weight and the Degree of Branching of Poly(1,4-phenylene sulfide) Samples through Their Partial Sulfonation

Shamim-Ara Pervin,Arun Anand Prabu,Kap-Jin Kim 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4

Structural characterization of industrial-grade poly(1,4-phenylene sulfide) (PPS) batch samples (solution- andmelt-polymerized) can only be carried out using expensive and least available solid-state NMR/high-thermal viscometer dueto their insolubility in common organic solvents even at 200 oC. In the present study, we prepared sulfonated PPS (sPPS)which is soluble in common organic solvents even at ambient temperature conditions, thereby facilitating its easiercharacterization in the solution state at R.T. using FTIR, NMR, and solution-viscosity measurements. sPPS was synthesizedthrough the anionic modification of PPS using chlorosulfonic acid (ClSO3H) and dichloromethane as a function of varyingPPS:ClSO3H mole ratio (1:5 and 1:10) and sulfonation time (1 to 48 h). A previously unreported methodology to identify thebranching types (phenylene and sulfide branching) in PPS was carried out using 1H-NMR curve-fitting analysis withLorentzian equation. Melt-polymerized PPS samples were analyzed to contain about two times higher degree of branchingthan the solution-polymerized PPS ones.

Prepared and characteristic of anion exchange membrane based on poly(phenylene oxide) with 3,5-dimethylaniline

정민호,정경석,황택성 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

The modified poly(phenylene oxide) was prepared with 3,5-dimethylaniline. The quaternery membrane was also prepared with bromination and trimethylamine as functionalized agent. The membrane produce consist of two reactions. The anion exchange membrane was prepared by casting method. The structure of membrane was investigated by fourier transform infrared (FT-IR) and proton nuclear magnetic resonance (H-NMR). The morphology of the surface of membrane was investigated with SEM. The properties of membranes such as ion exchange capacity, water uptake and electric resistance were measured by titration and LCR meter.

Poly(p-phenylene benzobisoxazole) 고성능 섬유의 자외선 저항성 향상을 위한 표면처리 기술 연구

박성우,강윤화,전길우,민병길,백두현,Park, Seong Woo,Kang, Yoon Hwa,Jeon, Gil Woo,Min, Byung Gil,Baik, Doo Hyun 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.3

A UV testing chamber was designed and prepared for testing the UV-resistance of poly(p-phenylene benzobisoxazole) (PBO) fibers. The optimum conditions for the test were established by measuring UV irradiation at a chamber position using various kinds of UV sources and different irradiation times. Expectedly, PBO fibers (Zylon$^{(R)}$) showed significant degradation under UV irradiation by exhibiting a decrease in the tensile strength and elongation of up to 37% and 18%, respectively. Selected UV-absorbing and -stabilizing agents were successfully coated onto the fibers using water-borne polyurethane. It was found that triazine-type UV absorbing agents were more effective than benzophenone- or benzotriazole-type agents in reducing the degradation of PBO fibers under UV irradiation.