scholarly journals The effect of molecular weight on the porosity of hypercrosslinked polystyrene

2015 ◽  
Vol 6 (41) ◽  
pp. 7280-7285 ◽  
Author(s):  
Thanchanok Ratvijitvech ◽  
Michael Barrow ◽  
Andrew I. Cooper ◽  
Dave J. Adams
Keyword(s):  
Molecular Weight ◽  
Hypercrosslinked Polystyrene ◽  
Degree Of Polymerisation ◽  
Microporous Polymers ◽  
Surface Areas

Microporous polymers can be prepared by crosslinking polystyrenes, with the surface areas being dependent on the degree of polymerisation.

Sequential Extraction of Lignin from Sugarcane Bagasse: Characterization and Application in the Pb(II) Adsorption

2019 ◽  
Vol 13 (4) ◽  
pp. 550-556 ◽  
Author(s):  
Ni Liu ◽  
Shuangfei Wang ◽  
Hongxiang Zhu ◽  
Xinliang Liu
Keyword(s):  
Molecular Weight ◽  
Sequential Extraction ◽  
Adsorption Property ◽  
Hydroxyl Group ◽  
Sem Images ◽  
Surface Areas ◽  
Lignin Fraction ◽  
Bet Analysis ◽  
Sequential Extraction Method ◽  
L1 And L2

Lignin was extracted from bagasse by sequential extraction method. The crude lignin was divided into three fractions by molecular weight and chemical functionality (Lignin fractions L1 and L2 were recovered with diethyl ether and methanol solubility respectively, with the L3 part remaining), and the properties of each were analyzed before being applied to Pb(II) adsorption. The results indicated that the L2 fraction has the largest molecular weight due to self-condensation. The weight of the aliphatic hydroxyl group of L2 is 4.63 times of L1 and 1.65 times of crude lignin. Scanning electron microscopy (SEM) images and Brunauer-Emmett-Teller (BET) analysis show that the surface of L2 and L3 are porous with surface areas of 2.8304 m2/g and 10.7530 m2/g, respectively. The characteristics of structure and morphology for the L2 and L3 fractions display better adsorption property than crude lignin and L1 fractions, with adsorption capacities of approximately 6.46 mg/g and 7.56 mg/g. This research confirmed that each lignin fraction possessed different chemical and physical characteristics, and the L2 fraction has good solubility and adsorption properties, which provide the basis for lignin modification applied to lead Pb(II) adsorption.

Carbon black nanoparticle trapping: A strategy to realize the true energy storage potential of redox-active conjugated microporous polymers

2021 ◽  
Author(s):  
Seung Uk Son ◽  
Changwan Kang ◽  
Yoon-Joo Ko ◽  
Sang Moon Lee ◽  
Hae Jin Kim ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electrode Materials ◽  
High Surface ◽  
Electric Energy ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Electric Energy Storage ◽  
Microporous Polymers ◽  
Surface Areas ◽  
Conjugated Microporous Polymers

Conjugated microporous polymers (CMPs) have significant potential as electrode materials for electric energy storage devices, due to their high surface areas, conjugation features, and chemical stability. However, the low conductivity...

Postmodification of linear poly- p -phenylenes to prepare hyper-crosslinked polymers: Tuning the surface areas by the molecular weight

Polymer ◽  
2015 ◽  
Vol 60 ◽  
pp. 234-240 ◽  
Author(s):  
Di Zhang ◽  
Liming Tao ◽  
Junping Ju ◽  
Yanming Wang ◽  
Qihua Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Crosslinked Polymers ◽  
Surface Areas ◽  
Linear Poly

Fast Adsorption of Erythromycin on the Conjugated Microporous Polymers

2014 ◽  
Vol 1073-1076 ◽  
pp. 32-38
Author(s):  
Chun Li Zheng ◽  
Miao Miao Du ◽  
Yu Zhou Rong
Keyword(s):  
Adsorption Process ◽  
Order Model ◽  
Water Separation ◽  
Film Diffusion ◽  
Microporous Polymers ◽  
Solvent Water ◽  
Surface Areas ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Conjugated Microporous Polymers

As a kind of ideal porous absorbents with tunable porosity, large surface areas, and hydrophobicity, conjugated microporous polymers (CMPs) have recently received extensive attention in oil/organic solvent-water separation. However, reports on the application of CMPs in adsorption of erythromycin (ERY) from water are very few. In this work, the adsorption of ERY by three kinds of CMPs was firstly studied. It was observed that all the CMPs extracted ERY quickly from water. The adsorption kinetics of ERY on the three CMPs was well expressed by the pseudo-second-order model, and the adsorption process was found to be mainly controlled by film diffusion. Increasing surface area of the CMPs resulted in greater extent of adsorption. This work may provide fundamental guidance for removal of antibiotics by CMPs.

Porous networks based on iron(ii) clathrochelate complexes

2019 ◽  
Vol 48 (14) ◽  
pp. 4582-4588 ◽  
Author(s):  
José L. Bila ◽  
Joffrey Pijeat ◽  
Andrea Ramorini ◽  
Farzaneh Fadaei-Tirani ◽  
Rosario Scopelliti ◽  
...  
Keyword(s):  
Hydrolytic Degradation ◽  
Microporous Polymers ◽  
Surface Areas ◽  
Porous Networks ◽  
Clathrochelate Complexes

Iron clathrochelate complexes were used for the preparation of microporous polymers. The networks display permanent porosity with apparent Brunauer–Emmett–Teller surface areas of up to SABET = 593 m2 g−1, and they are not susceptible to hydrolytic degradation.

scholarly journals Ultradrawing and Ultimate Tenacity Properties of Ultrahigh Molecular Weight Polyethylene Composite Fibers Filled with Nanosilica Particles with Varying Specific Surface Areas

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Jen-taut Yeh ◽  
Chuen-Kai Wang ◽  
Lu-Kai Huang ◽  
Chih-Chen Tsai ◽  
Wei-Yu Lai
Keyword(s):  
Molecular Weight ◽  
Specific Surface ◽  
Tensile Properties ◽  
Surface Area ◽  
Specific Surface Area ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Surface Areas ◽  
Ultrahigh Molecular Weight ◽  
Specific Surface Areas ◽  
Nanosilica Particles

Original and/or functionalized nanosilica particles with a quoted specific surface area of 100, 300, and 600 m2/g, respectively, were used to investigate the influence of specific surface areas of nanosilica particles on ultradrawing and ultimate tensile properties of ultrahigh molecular weight polyethylene (UHMWPE), UHMWPE/nanosilica, and UHMWPE/functionalized nanosilica fibers. The specific surface areas of well-dispersed functionalized nanosilica particles in UHMWPE/functionalized nanosilica fibers can positively affect their ultradrawing, orientation, ultimate tensile properties, and “micro-fibrils” morphologies. Excellent orientation and ultimate tensile properties of UHMWPE/nanofiller fibers can be prepared by ultradrawing the UHMWPE/functionalized nanosilica as-prepared fibers with optimal contents of the best prepared functionalized nanosilica particles well dispersing in the as-prepared fibers. The ultimate tensile strength value of the best prepared UHMWPE/functionalized nanosilica drawn fiber reaches 7.6 GPa, which is about 2.3 times of those of the best prepared UHMWPE drawn fiber without addition of any nanofiller. Specific surface area, morphological and Fourier transform infrared analyses of original and functionalized nanosilica particles, and/or investigations of thermal, orientation factor, and ultimate tensile properties of as-prepared and/or drawn UHMWPE/functionalized nanosilica fibers were performed to understand the above improved ultradrawing and ultimate tensile properties of the UHMWPE/functionalized nanosilica as-prepared and/or drawn fibers.

Conjugated microporous polymers using a copper-catalyzed [4 + 2] cyclobenzannulation reaction: promising materials for iodine and dye adsorption

2021 ◽  
Vol 12 (15) ◽  
pp. 2282-2292
Author(s):  
Noorullah Baig ◽  
Suchetha Shetty ◽  
Saleh Al-Mousawi ◽  
Bassam Alameddine
Keyword(s):  
Methylene Blue ◽  
Dye Adsorption ◽  
Design Strategy ◽  
Microporous Polymers ◽  
Surface Areas ◽  
Conjugated Microporous Polymers

A new design strategy is disclosed to synthesize conjugated microporous polymers using a Cu-catalyzed [4 + 2] cyclobenzannulation reaction. The polymers reveal BET surface areas up to 794 m2 g−1 and promising uptake of iodine and methylene blue.

Influence of the degree of polymerisation and of the architecture on the elastic properties of new polyurea elastomers

RSC Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 6758-6770 ◽  
Author(s):  
Antoni Sánchez-Ferrer ◽  
Daniel Rogez ◽  
Philippe Martinoty
Keyword(s):  
Molecular Weight ◽  
Elastic Properties ◽  
Chemical Nature ◽  
Degree Of Polymerisation ◽  
End Groups

The elastic properties of new polyurea elastomers have been studied by varying the segmental molecular weight and the chemical nature of the polymer end groups showing up to two plateaus.

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