01814nas a2200169   4500008004100000022001500041245014400056210006900200260000900269300001200278490000800290520115400298100002101452700002201473700002801495856012101523       2018                        eng d  a1381-5148 00aSpiro [fluorene-9,9 '-xanthene]-containing copolymers of intrinsic microporosity: synthesis, characterization and gas permeation properties0 aSpiro fluorene99 xanthenecontaining copolymers of intrinsic micr  c2018  a153-1600 v1333 aIn the present study, a new bis(catechol) containing spiro[fluorene-9,9'-xanthene], namely, 4,4'-(spiro(fluorene9,9'-xanthene]-2',7'-diyl)bis(benzene-1,2-diol) (THSFX) was designed and synthesized. Polycondensation reactions of THSFX and varying compositions of THSFX and 5,5',6,6'-tetrahydroxy-3,3,3',3'-tetramethyl-1,1'-spirobisindane (TTSBI) were carried out with 2,3,5,6-tetrafluoroterephthalonitrile (TFTPN) to obtain a homopolymer and copolymers, respectively. The organo-soluble polymers exhibited reasonably high molecular weights (23300-34,100 g/mol) and could be cast into self-standing films from their chloroform solutions. X-Ray diffraction studies indicated that PIMs were amorphous in nature. These polymers exhibited high thermal stability (T-10 = 490-510 degrees C) and possessed intrinsic microporosity with high BET surface area (360-796 m(2)/g). The gas permeation properties of SFX-PIM-25 and SFX-PIM-33 were evaluated and they exhibited high gas permeability (CO2 = 3595-4034 Barrer). The gas permeability data of SFX-PIM-25 and SFX-PIM-33 was located close to 1991 Robson upper bound for CO2/N-2, CO2/CH4 and O-2/N-2 gas pairs1 aShrimant, Bharat1 aKharul, Ulhas, K.1 aWadgaonkar, Prakash, P.  uhttp://library.ncl.res.in/content/spiro-fluorene-99-xanthene-containing-copolymers-intrinsic-microporosity-synthesis02570nas a2200241   4500008004100000022001400041245012400055210006900179260000900248300001000257490000700267520172200274653001501996653001902011653002802030653001402058653003302072100002102105700002602126700002202152700002802174856012602202       2018                        eng d  a0887-624X00aSynthesis, characterization, and gas permeation properties of adamantane-containing polymers of intrinsic microporosity0 aSynthesis characterization and gas permeation properties of adam  cJAN   a16-240 v563 a<p>A new bis(catechol) monomer, namely, 4,4-((1r,3r)-adamantane-2,2-diyl)bis(benzene-1,2diol) (THADM) was synthesized by condensation of 2-adamantanone with veratrole followed by demethylation of the formed (1r,3r)-2,2-bis(3,4 dimethoxyphenyl)adamantane. Polycondensation of THADM and various compositions of THADM and 5,5,6,6-tetrahydroxy-3,3,3,3-tetramethylspirobisindane was performed with 2,3,5,6-tetrafluoroterephthalonitrile (TFTPN) to obtain the homopolymer and copolymers. These polymers demonstrated good solubility in common organic solvents such as dichloromethane, chloroform, and tetrahydrofuran and could be cast into tough films from their chloroform solutions. GPC analysis revealed that number average molecular weights of polymers were in the range 48,100-61,700 gmol(-1), suggesting the formation of reasonably high molecular weight polymers. They possessed intrinsic microporosity with Brunauer-Emmett-Teller (BET) surface area in the range 703-741 m(2)g(-1). Thermogravimetric analysis of polymers indicated that 10% weight loss temperature was in the range 513-518 degrees C demonstrating their excellent thermal stability. THADM-based polymer of intrinsic microporosity (PIM) showed P(CO2)=1080, P(O-2)=232 and appreciable selectivity [(CO2/CH4)=22.6, (CO2/N-2)=26.7, and (O-2/N-2)= 5.7]. The gas permeability measurements revealed that with increase in the content of adamantane units in PIMs, selectivity increased and permeability decreased, following the trade-off relationship. The gas separation properties of PIMs containing adamantane units were located close to 2008 Robeson upper bound for gas pairs such as CO2/CH4, CO2/N-2, H-2/N-2, and O-2/N-2. (c) 2017 Wiley Periodicals, Inc.</p>10aadamantane10aGas permeation10aintrinsic microporosity10amembranes10astructure-property relations1 aShrimant, Bharat1 aShaligram, Sayali, V.1 aKharul, Ulhas, K.1 aWadgaonkar, Prakash, P.  uhttp://library.ncl.res.in/content/synthesis-characterization-and-gas-permeation-properties-adamantane-containing-polymers