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7,905 Newest Publications about the topic molecular weight


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Solid base catalyzed depolymerization of lignin into low molecular weight products

06-Dec-2016 | Richa Chaudhary; Paresh Laxmikant Dhepe, Green Chemistry, 2016

For biorefinery concept to become commercially viable, it is essential to value-add lignin which is the only naturally available aromatic polymer. A one-pot depolymerization of lignin into reactive substituted phenolic compounds (platform chemicals and octane enhancers) with low molecular weight ...


Pillar arrays of tethered polyvinyltetrazole on silicon as a visualization platform for sensing of lead ions

04-Dec-2016 | Author(s): Jun-Ru Zeng, Chih-Chia Cheng, Bohr-Ran Huang, Chi-Hsien Huang, Jem-Kun Chen, Sensors and Actuators B: Chemical, 2016

Publication date: May 2017 Source:Sensors and Actuators B: Chemical, Volume 243 Author(s): Jun-Ru Zeng, Chih-Chia Cheng, Bohr-Ran Huang, Chi-Hsien Huang, Jem-Kun Chen Using click reactions, we have grafted N-propargyl polyacrylonitrile (PAN) to a dot matrix presenting ...


Nanocrystal Formation in Aqueous Insertion Polymerization

02-Dec-2016 | Alexandra Godin; Inigo Göttker-Schnetmann; Stefan Mecking, Macromolecules, 2016

High molecular weight linear polyethylene, in the form of 7 nm thin single-lamella nanocrystals with a diameter of up to 200 nm, is generated via aqueous catalytic polymerization using the water-soluble catalyst precursor ...


Degradation of radiation exposed polymethacrylamide (Rohacell® 31) foam used in composite hardware

30-Nov-2016 | R. J. Zaldivar, A. Labatete‐Goeppinger, M. P. Easton, D. N. Patel, Journal of Applied Polymer Science, 2016

ABSTRACT Rohacell® foam is a critical structural component used to fabricate composite hardware for space applications. The effect of radiation exposure on Rohacell® 31 HFHT has been evaluated to determine the degree of chemical and mechanical degradation that may occur in a space environment. ...


Ethylene (Co)polymerization by Binuclear Nickel Phenoxyiminato Catalysts with Cofacial Orientation

30-Nov-2016 | Zhongtao Chen; Erdong Yao; Jianchun Wang; Xinyi Gong; Yuguo Ma, Macromolecules, 2016

A series of neutral binuclear nickel phenoxyiminato catalysts connected by rigid skeletons of different lengths have been efficiently synthesized. The rigid skeleton and bulky tert-butyl groups together force two nickel coordination planes to get close and stack in an anti cofacial fashion. With ...


End-Site-Specific Conjugation of Enoxaparin and Tetradeoxycholic Acid Using Nonenzymatic Glycosylation for Oral Delivery

30-Nov-2016 | Jooho Park; Ok Cheol Jeon; Jisuk Yun; Hwajung Nam; Jinha Hwang; Taslim A. Al-Hilal; Kwangmeyung Kim; Kyungjin Kim; Y ..., Journal of Medicinal Chemistry, 2016

Heparin and low molecular weight heparins (LMWHs) have been the drug of choice for the treatment or the prevention of thromboembolic disease. Different methods are employed to prepare the LMWHs that are clinically approved for the market currently. In particular, enoxaparin, which has a reducing ...


Intrinsic Stresses in Thin Glassy Polymer Films Revealed by Crack Formation

29-Nov-2016 | Mithun Chowdhury; Xiaoyuan Sheng; Falko Ziebert; Arnold C.-M. Yang; Alessandro Sepe; Ullrich Steiner; Günter Reiter, Macromolecules, 2016

Both spin-coating and thermal annealing of thin supported glassy polymer films generally cause stresses arising from rapid solvent evaporation and from a mismatch in expansivities of film and substrate, respectively. While films on adhesive surfaces are typically stable, on slippery substrates ...


Isocyanate‐ and Solvent‐Free Route to Thermoplastic Poly(amide‐urea) Derived from Renewable Resources

28-Nov-2016 | Benjamin S. Ritter, Rolf Mülhaupt, Macromolecular Materials and Engineering, 2016

This study reports on tailoring biobased aliphatic poly(amide‐urea) (PAU) thermoplastics by means of reactive extrusion requiring neither the use of diisocyanate monomers nor time‐consuming PAU polycondensation in a separate step prior to melt processing. Key intermediate is ...


More wear‐resistant and ductile UHMWPE composite prepared by the addition of radiation cross‐linked UHMWPE powder

28-Nov-2016 | Honglong Wang, Lu Xu, Mingxing Zhang, Rong Li, Zhe Xing, Jiangtao Hu, Mouhua Wang, Guozhong Wu, Journal of Applied Polymer Science, 2016

ABSTRACT Radiation cross‐linked ultrahigh molecular weight polyethylene (X‐UHMWPE) powder was prepared by γ‐ray irradiation under nitrogen atmosphere with a dose of 50–200kGy at a dose rate of 7kGy/h and further annealing in vacuum at 120 °C for 4 h. The cross‐linked powder was characterized ...


IJMS, Vol. 17, Pages 1988: Extraction, Structural Characterization, and Potential Antioxidant Activity of the Polysaccharides from Four Seaweeds

28-Nov-2016 | He, Jinzhe ; Xu, Yaoyang ; Chen, Hongbo ; Sun, Peilong, International Journal of Molecular Sciences, 2016

Four seaweed polysaccharides were extracted from Sarcodia ceylonensis, Ulva lactuca L., Gracilaria lemaneiformis, and Durvillaea antarctica, respectively, by microwave-assisted extraction. The effect of three significant variables (extraction time, extraction temperature, and the ratio of water ...


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