02121nas a2200241 4500008004100000022001400041245009900055210006900154260007300223300001200296490000700308520126100315653002101576653002501597653002701622653001101649653001301660653002501673100002301698700001501721700001801736856012501754 2006 eng d a0167-577X00aHydrothermal synthesis of MCM-41 using differently manufactured amorphous dioxosilicon sources0 aHydrothermal synthesis of MCM41 using differently manufactured a aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a957-9610 v603 a

The influence of differently manufactured amorphous dioxosilicon sources such as fumed silica (FS), spray dried precipitated silica (PSI) and flash dried precipitated silica (PS,) on the course of structural development and properties of hydrothermally prepared siliceous MCM-41 phases have been investigated. Powder XRD, N-2 adsorption/desorption and scanning electron microscopy techniques were used for sample characterization. On the basis of results obtained from time dependent study on the progressive development of MCM-41 mesophases, the reactivity trend of dioxosilicon sources observed was as: FS > PS1 > PS2. MCM-41 synthesized using least expensive PS2 having less surface area has exhibited thicker pore walls but poor orderness, while MCM-41 prepared from expensive FS having high surface area has thinner pore walls and was well ordered. The extent of contraction caused by calcination, magnitude of the wall thickness and structural stability were found to be dependent on manufacturing process of dioxosilicon sources. The noticeable morphological differences were also observed by variations in the type of dioxosilicon sources used in the hydrothermal synthesis MCM-41 materials. (c) 2005 Elsevier B.V. All rights reserved.

10aCharacterization10adioxosilicon sources10aHydrothermal synthesis10aMCM-4110aporosity10aStructural stability1 aGaydhankar, T., R.1 aSamuel, V.1 aJoshi, P., N. uhttps://library.ncl.res.in/content/hydrothermal-synthesis-mcm-41-using-differently-manufactured-amorphous-dioxosilicon-001858nas a2200241 4500008004100000022001400041245006700055210006700122260007300189300001400262490000700276520105200283653003201335653001601367653002701383653001301410653001601423100001901439700001601458700002401474700001901498856009901517 2006 eng d a1381-514800aNovel beaded polymers from telechelic methacrylic ether esters0 aNovel beaded polymers from telechelic methacrylic ether esters aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a1087-10960 v663 a

A series of telechelic dimethacrylic ether-esters (MEE) were prepared by solventless reaction of alpha,omega-dihydroxy poly(oxytetramethylene) (polytetrahydrofuran, PTHF) with phthalic anhydride and glycidyl methacrylate (GMA). MEE was polymerized with GMA as well as GMA-ethylene dimethacrylate (EGDM) to form porous beads. The terpolymer beads were observed using optical microscopy and SEM and characterized for internal pore volume, equilibrium volume-swelling ratio and dimethyl formamide and aqueous buffer regain. The morphology of the beads was dictated by the mole fraction and molecular weight of MEE in the feed. Porosity was found to increase with increase in molecular weight of MEE. Thus, porosity as high as 49%, 50% and 55% was observed with MEE of molecular weights 1580, 2580 and 3480, respectively. At a specific terpolymerization feed ratio of monomers, the terpolymers formed transform from gel like structure into a macroporous one, with increase in molecular weight of MEE. (c) 2006 Elsevier B.V. All rights reserved.

10aether-ester dimethacrylates10amacroporous10aPore size distribution10aporosity10atelechelics1 aPujari, N., S.1 aTrivedi, J.1 aIngavle, Ganesh, C.1 aPonrathnam, S. uhttps://library.ncl.res.in/content/novel-beaded-polymers-telechelic-methacrylic-ether-esters-002512nas a2200241 4500008004100000022001400041245010100055210006900156260007700225300001400302490000700316520163400323653002101957653001301978653001301991653001302004100002502017700002402042700002602066700002102092700002502113856013202138 2007 eng d a0947-653900aExhaustive analysis of frontal copolymerization of functionalized monovinyl and divinyl monomers0 aExhaustive analysis of frontal copolymerization of functionalize aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcAPR a5862-58720 v133 a

A series of copolymers of 2-hydroxyethyl methacrylate (HEMA)/ glycidyl methacrylate (GMA) and ethylene dimethacrylate (EGDM) were synthesized by frontal polymerization (FP). This study was conducted to investigate the effect of crosslink density, type and concentration of initiator, the use of a complex initiator system, porogen, and diluent on the most relevant parameters of FP, such as sustainability of the front, temperature profile, front velocity, and yield. The products were also characterized for intruded pore volume, pore-size distribution, epoxy-functionality number, and surface morphology. Higher crosslink densities (CLDs) and initiator concentration produced higher front velocities, whereas no trend in front temperature was noted. A complex initiation system was effective in stabilizing and increasing the polymerization yield. Relative to suspension polymerization (SP), FP products synthesized without a solvent were microporous, whereas micro-to-macroporous products were obtained in the presence of a solvent (for HEMA-EGDM polymers). We also present, explain, and discuss the exotic patterns observed under a microscope. We observed two basic types of spatial patterns, namely, planar and nonplanar patterns. The type of planar pattern observed under scanning electron microscopy (SEM) has a spatial impulse that appears as a loop followed by regular periodic motion in the radial and axial directions. This behavior gives rise to a repeating pattern that is a few microns thick. Also, nonplanar patterns, namely, layered concentric rings and winding staircase patterns, were observed under SEM.

10acopolymerization10apatterns10aPolymers10aporosity1 aPujari, Narahari, S.1 aInamdar, Satish, R.1 aAmbekar, Jalindar, D.1 aKulkarni, B., D.1 aPonrathnam, Surendra uhttps://library.ncl.res.in/content/exhaustive-analysis-frontal-copolymerization-functionalized-monovinyl-and-divinyl-monomers-001891nas a2200229 4500008004100000022001400041245014400055210006900199260007300268300001200341490000800353520100000361653002501361653002801386653002501414653001301439653001701452100002001469700002401489700001801513856013001531 2008 eng d a1387-181100aNew microporous MOF material based on Zn(II)-polycarboxylate coordination polymer synthesized with the aid of 1,6-diaminohexane as template0 aNew microporous MOF material based on ZnIIpolycarboxylate coordi aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a204-2090 v1163 a

A new microporous metal-organic framework (MOF) material ZBTEC-1 has been synthesized by designing infinite coordination polymer network formed between Zn(II) and 1,2,4,5-benzenetetracarboxylic acid (BTEC) under solvothermal conditions in the presence of 1,6-diaminohexane (DAH) as a single molecule template. Powder XRD data demonstrate that the ZBTEC-1 material has a new MOF structure. N-2 sorption studies indicated moderately good surface area (306 m(2) g(-1)) with large size micropores (average pore diameter ca. 0.7 nm) and very high pore volume (1.93 ccg(-1)). C-13 solid state MAS-NMR, FT-IR and UV-visible spectroscopic studies showed the presence of BTEC moieties in the framework. TEM and FE-SEM analysis indicated 30-60 nm diameter size microporous spherical particles for the ZBTEC-1 crystallites. This novel MOF material showed good hydrogen adsorption capacity at 77 K, indicating its potential application in hydrogen storage. (C) 2008 Elsevier Inc. All rights reserved.

10aCoordination polymer10aMetal-organic framework10aMicroporous material10aporosity10aZinc complex1 aChandra, Debraj1 aKasture, Mahesh, W.1 aBhaumik, Asim uhttps://library.ncl.res.in/content/new-microporous-mof-material-based-znii-polycarboxylate-coordination-polymer-synthesized-002343nas a2200241 4500008004100000022001400041245008200055210006900137260006700206300001200273490000700285520151200292653001401804653001701818653002601835653001701861653001301878100002601891700002401917700002101941700002501962856011401987 2015 eng d a0959-810300aPorous poly(ethylene glycol)-polyurethane hydrogels as potential biomaterials0 aPorous polyethylene glycolpolyurethane hydrogels as potential bi a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcMAR a397-4040 v643 a

We report the synthesis of porous poly(ethylene glycol)-polyurethane (PEG-PU) hydrogels using PEG-4000 as a soft segment and 4,4-methylenebis(cyclohexylisocyanate) as a hard segment. The degree of swelling in the hydrogels could be controlled by varying the amount of crosslinking agent, namely 1,2,6-hexanetriol. Structural characterization of the hydrogels was performed using solid-state C-13 NMR and Fourier transform infrared spectroscopy. Wide-angle X-ray diffraction studies revealed the existence of crystalline domains of PEG and small-angle X-ray scattering studies showed the presence of lamellar microstructures. For generating a porous structure in the hydrogels, cryogenic treatment with lyophilization was used. Scanning electron microscopy and three-dimensional micro-computed tomography imaging of the hydrogels indicated the presence of interconnected pores. The mechanical strength of the hydrogels and xerogels was measured using dynamic mechanical analysis. The observed dynamic storage moduli (E) for the equilibrium swollen and dry gels were found to be 0.15 and 4.2 MPa, respectively. Interestingly, the porous PEG-PU xerogel also showed E of 5.6 MPa indicating a similar mechanical strength upon incorporating porosity into the gel matrix. Finally, preliminary cytocompatibility studies showed the ability of cells to proliferate in the hydrogels. These gels show promise for applications as scaffolds and implants in tissue engineering. (c) 2014 Society of Chemical Industry

10ahydrogels10apermeability10apoly(ethylene glycol)10apolyurethane10aporosity1 aDivakaran, Anumon, V.1 aTorris, Arun, A. T.1 aLele, Ashish, K.1 aBadiger, Manohar, V. uhttps://library.ncl.res.in/content/porous-polyethylene-glycol-polyurethane-hydrogels-potential-biomaterials-001901nas a2200325 4500008004100000022001400041245010500055210006900160260000800229490000700237520089800244653001501142653001501157653002301172653001801195653001901213653001901232653001801251653001001269653001301279653001501292100001901307700002001326700001601346700002401362700002401386700001401410700002301424856012801447 2017 eng d a1466-803300aModular assembly of porous organic cage crystals: isoreticular quasiracemates and ternary co-crystal0 aModular assembly of porous organic cage crystals isoreticular qu cSEP0 v193 a

Small changes in molecular structure and crystallisation conditions can have a profound effect on the crystal packing of molecules. Increasing the system complexity-for example, by introducing multiple components-greatly increases the number of potential outcomes. Hence, the rational design of porous cocrystals with multiple components is challenging. Here, we report a family of isoreticular quasiracemate crystalline phases for porous organic cages, FT-RCC3-R center dot CCX-S (where X = 1, 2, or 4), that were prepared in a modular and predictable fashion. By using directional intermolecular interactions between cages, we were able to prepare a rare ternary co-crystal, (CC3-S(0.5)CC4-S-0.5)center dot(CC13-S(0.5)CC3-S(0.25)CC4-S-0.25).

10acocrystals10aFrameworks10aGas-chromatography10aHalogen Bonds10aHydrogen-bonds10aMolecular Cage10aNanoparticles10aPores10aporosity10aSeparation1 aTothadi, Srinu1 aLittle, Marc, A1 aHasell, Tom1 aBriggs, Michael, E.1 aChong, Samantha, Y.1 aLiu, Ming1 aCooper, Andrew, I. uhttps://library.ncl.res.in/content/modular-assembly-porous-organic-cage-crystals-isoreticular-quasiracemates-and-ternary-co02420nas a2200241 4500008004100000022001400041245017000055210006900225260000800294300001200302490000700314520153400321653002401855653001301879653002001892653002501912653003001937100002401967700001701991700002502008700002002033856012502053 2023 eng d a0959-810300aHighly interconnected porous monolithic and beaded polymers using high internal phase emulsion polymerization: tuning porous architecture through synthesis variables0 aHighly interconnected porous monolithic and beaded polymers usin cAPR a451-4660 v723 a

Open porous polymeric materials have gained popularity due to their exceptional properties and applications in tissue engineering scaffolds, drug delivery, enzyme immobilization and catalysis support. This study developed a novel two-stage approach to create networked, crosslinked poly(2-hydroxyethyl methacrylate-co-N,N'-methylenebisacrylamide) HEMA-MBA beads. The first part involves producing an oil-in-water-in-oil high internal phase emulsion (HIPE). This is followed by suspension polymerization using a redox initiator pair. In this study, a mixed surfactant combination with low and high hydrophilicity-lipophilicity balance surfactants was identified and successfully utilized to prepare a stable oil-in-water-in-oil HIPE. The effect of crosslinker concentration (i.e. crosslink density), surfactant concentration and monomer-to-porogen ratio on pore architecture and surface area were successfully evaluated. In addition, a new protocol was developed to synthesize HEMA-MBA monoliths using an oil-in-water HIPE method at ambient temperature using a redox initiator pair. The effect of crosslink density and oil phase on pore architecture and surface area was evaluated. Key variables affecting the morphology of porous HEMA-MBA beads and monoliths were identified and quantified, allowing future development of porous HEMA-based polymer beads and monoliths with tunable morphologies which are suitable for numerous applications, especially in the biomedical field. (c) 2022 Society of Industrial Chemistry.

10aHIPE polymerization10aporosity10aporous polymers10aredox polymerization10aSuspension polymerization1 aPonrathnam, Timothy1 aBehere, Isha1 aPonrathnam, Surendra1 aIngavle, Ganesh uhttps://library.ncl.res.in/content/highly-interconnected-porous-monolithic-and-beaded-polymers-using-high-internal-phase