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8,560 Newest Publications about the topic molecular weight

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A facile access route to segmented copolymers by fusing ambient temperature step-growth and RAFT polymerization

13-Sep-2017 | Thomas Gegenhuber; Alexander Schenzel; Anja S. Goldmann; Per Bo Zetterlund; Christopher Barner-Kowollik, Chemical Communication, 2017

WWe introduce the synthesis of segmented copolymers via a catalyst-free Diels-Alder (DA) reaction at ambient temperature via step-growth (SG) polymerization and subsequent RAFT polymerization. High molecular weight SG polymers are readily obtained (Mw = 40,000 g∙mol-1), featuring trithiocarbonate ...

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Low Molecular Weight Gelators (LMWGs) for Ionic Liquids: The Role of Hydrogen Bonding and Sterics in the Formation of Stable Low Molecular Weight Ionic Liquid Gels.

13-Sep-2017 | Peter McNeice; Yingying Zhao; Jianxun Wang; Gerald Francis Donnelly; patricia Catherine marr, Green Chemistry, 2017

Low molecular weight gelators capable of forming a gel with an ionic liquid are rare. We report the ability of 3 sugar based gelators from renewable resources (derived from isosorbide and mannitol) to form gels with 21 ionic liquids comprising a range of cations and anions that are commonly ...

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Molecules, Vol. 22, Pages 1506: New Tetra-Schiff Bases as Efficient Photostabilizers for Poly(vinyl chloride)

09-Sep-2017 | Ahmed, Dina S.; El-Hiti, Gamal A.; Hameed, Ayad S.; Yousif, Emad ; Ahmed, Ahmed, Molecules, 2017

Molecules, Vol. 22, Pages 1506: New Tetra-Schiff Bases as Efficient Photostabilizers for Poly(vinyl chloride) Molecules doi: 10.3390/molecules22091506 Authors: Dina Ahmed Gamal El-Hiti Ayad Hameed Emad Yousif Ahmed Ahmed Three new tetra-Schiff bases were synthesized and ...

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Tri‐ammonium end functional PE: facile synthesis and application as an intercalation agent

08-Sep-2017 | Yongjie Zhang, Xiaopei Li, Shuwei Wang, Jing Xu, Huayi Li, Polymer International, 2017

Abstract Organo‐modification of montmorillonite (MMT) is crucial for the promotion of fine dispersion of MMT into (often hydrophobic) polymer matrix. Ammonium terminated polymers are more efficient in modifying clay compared to small organic cations such as alkyl ammoniums or side ...

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Study on morphology, molecular weight and thermal properties of composite microspheres prepared by controlling feeding ways and reaction time

08-Sep-2017 | Dan Zhao, Yu Jiang, Guangda Zhu, Junping Zheng, Yong Ding, Journal of Applied Polymer Science, 2017

ABSTRACT The application of composite microspheres closely lies on their morphology and properties. In this work, carbon nanotubes (CNTs) reinforced composite microspheres were prepared via in situ polymerization: methyl methacrylate was selected as matrix to copolymerize with cationic ...

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Synthesis and characterization of novel natural rubber based cationic waterborne polyurethane—Effect of emulsifier and diol class chain extender

08-Sep-2017 | Nathapong Sukhawipat, Nitinart Saetung, Jean‐Francois Pilard, Sophie Bistac, Anuwat Saetung, Journal of Applied Polymer Science, 2017

ABSTRACT Novel cationic waterborne polyurethanes (cWPU) were synthesized by step‐growth polymerization of hydroxyl telechelic natural rubber, molecular weight of 2800 gmol−1, toluene‐2,4‐diisocyanate, N‐methyl diethanolamine (NMDEA) as an emulsifier. The chemical structure of cWPU was ...

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Viscoelastic Behavior of Unentangled POSS–Styrene Nanocomposites and the Modification of Macromolecular Dynamics

08-Sep-2017 | Angel Romo-Uribe, Macromolecules, 2017

The viscoelastic properties of molten unentangled hybrid nanocomposites poly[(propylmethacryl-heptaisobutyl-POSS)-co-styrene], denoted POSS-sty, were investigated; POSS content varied up to 45 wt %. Unentangled polystyrene (PS) was also investigated. Differential scanning calorimetry (DSC) showed ...

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Purification and Characterization of Latent Polyphenol Oxidase from Apricot (Prunus armeniaca L.)

08-Sep-2017 | Ala eddine Derardja; Matthias Pretzler; Ioannis Kampatsikas; Malika Barkat; Annette Rompel, Journal of Agricultural and Food Chemistry, 2017

Polyphenol oxidase from apricot (Prunus armeniaca) (PaPPO) was purified in its latent form (L-PaPPO), and the molecular weight was determined to be 63 kDa by SDS-PAGE. L-PaPPO was activated in the presence of substrate at low pH. The activity was enhanced by CuSO4 and low concentrations (≤ 2 mM) ...

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Antioxidant activity of queen bee larvae processed by enzymatic hydrolysis

07-Sep-2017 | Deyuan Dong, Mengyi Dong, Kemei Liu, Yu Lu, Bo Yu, Journal of Food Processing and Preservation, 2017

Abstract Queen bee larvae (QBL), by‐products of royal jelly processing, was enzymatically hydrolyzed to produce bioactive peptides. Five enzymes were firstly used to obtain hydrolysates which were evaluated for their antioxidative performances. QBL hydrolyzed by pepsin, showing the highest ...

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Sensors, Vol. 17, Pages 2044: Aptamer-Based Single-Step Assay by the Fluorescence Enhancement on Electroless Plated Nano Au Substrate

07-Sep-2017 | Nambi Krishnan, Jegatha ; Park, Sang-Hwi ; Kim, Sang Kyung, Sensors, 2017

Sensors, Vol. 17, Pages 2044: Aptamer-Based Single-Step Assay by the Fluorescence Enhancement on Electroless Plated Nano Au Substrate Sensors doi: 10.3390/s17092044 Authors: Jegatha Nambi Krishnan Sang-Hwi Park Sang Kim A new single-step aptamer-based surface-enhanced ...

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