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7,721 Newest Publications about the topic molecular weight

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Supercritical water hydrolysis: a pathway for producing low-molecular-weight cellulose

27-Sep-2016 | Jean Buffiere; Patrik Ahvenainen; Marc Borrega; Kirsi Svedström; Herbert Sixta, Green Chemistry, 2016

This work discusses the suitability of supercritical water treatment (SCWT) for depolymerising microcrystalline cellulose in a controlled way. The SCWT partially hydrolysed cellulose down to a mixture of three valuable products: water-insoluble low-molecular-weight cellulose (WI-LMWC) ...

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Developing a self-healing supramolecular nucleoside hydrogel

27-Sep-2016 | Kathryn Skilling; Barrie Kellam; Marianne Ashford; Tracey D Bradshaw; Maria Marlow, Soft Matter, 2016

Low molecular weight gelator hydrogels provide a viable alternative to traditional polymer based drug delivery platforms, owing to their tunable stability and in most cases inherent biocompatibility. Here we report the first self-healing nucleoside hydrogel using N4-octanoyl-2ʹ-deoxycytidine (0.5 ...

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When CMRP met alkyl vinyl ketone: visible light induced living radical polymerization (LRP) of ethyl vinyl ketone (EVK)

27-Sep-2016 | Yaguang Zhao; Xu Liu; Yuchu Liu; Zhenqiang Wu; Xianyuan Zhao; Xuefeng Fu, Chemical Communication, 2016

Photo responsive polyethyl vinyl ketone (PEVK) and various block copolymers were prepared through the visible light induced cobalt mediated radical polymerization (CMRP) process. The first order kinetics and linear increase in molecular weight with conversion demonstrated a well-behaved system. ...

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Binary Copolymerization of 4‐methyl‐1,3‐pentadiene with Styrene, Butadiene and Isoprene Catalyzed by a Titanium [OSSO]‐type Catalyst

24-Sep-2016 | Marianna Loria, Antonio Proto, Carmine Capacchione, Polymer International, 2016

ABSTRACT Binary copolymerization of 4‐methyl‐1,3‐pentadiene (4MPD) with styrene, butadiene and isoprene promoted by the titanium complex dichloro{1,4‐dithiabutanediyl‐2,2'‐bis[4,6‐bis(2‐phenyl‐2‐propyl)phenoxy]}titanium (1) activated by methylaluminoxane (MAO) is reported. All the copolymers ...

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Mutual macromolecular crowding as the basis for polymer solution non‐ideality

23-Sep-2016 | Mary K. Cowman, Polymers for Advanced Technologies, 2016

Semidilute polymer solutions differ greatly from dilute solutions in properties such as viscosity, relaxation time, elastic modulus, colloid osmotic pressure, and light scattering. Previously, Matsuoka and Cowman proposed a single semiempirical expression for the nonideality contribution due to ...

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Automatic Control of Polymer Molecular Weight during Synthesis

23-Sep-2016 | Terry McAfee; Natalie Leonardi; Rick Montgomery; Julia Siqueira; Thomas Zekoski; Michael F. Drenski; Wayne F. Reed, Macromolecules, 2016

The continuous record of monomer and polymer concentrations, Cm and Cp, and cumulative weight-average mass, Mw, furnished by automatic continuous online monitoring of polymerization reactions (ACOMP) has been harnessed to provide feedback to control reactor monomer flow in order to follow a ...

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Predicting Rat and Human Pregnane X Receptor Activators Using Bayesian Classification Models

23-Sep-2016 | Mohamed Diwan M. AbdulHameed; Danielle L. Ippolito; Anders Wallqvist, Chemical Research in Toxicology, 2016

The pregnane X receptor (PXR) is a ligand-activated transcription factor that acts as a master regulator of metabolizing enzymes and transporters. To avoid adverse drug–drug interactions and diseases such as steatosis and cancers associated with PXR activation, identifying drugs and chemicals ...

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Improvement of antifouling performance of poly(l‐lactic acid) membranes through incorporating polyaniline nanoparticles

22-Sep-2016 | Bin Jiang, Baoyu Wang, Luhong Zhang, Yongli Sun, Xiaoming Xiao, Na Yang, Haozhen Dou, Journal of Applied Polymer Science, 2016

ABSTRACT Poly(l‐lactic acid) (PLLA) composite membranes were fabricated by nonsolvent induced phase separation method using polyaniline (PANI) as an additive. Membrane structure was characterized by attenuated total reflectance Fourier transform‐infrared spectroscopy, X‐ray diffraction, ...

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The cohesive energy density of polymers and its relationship to surface tension, bulk thermodynamic properties, and chain structure

22-Sep-2016 | Gregory T. Dee, Bryan B. Sauer, Journal of Applied Polymer Science, 2016

ABSTRACT The cohesive energy density (CED) and the internal pressure (Pi) have similar values for most liquids at low pressures. For most polymers CED cannot be directly measured, unlike Pi which is readily obtained in the melt from PVT or other related data. Directly measured CED are ...

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Variation of periodic crazing based on polymer blends of an ultra‐high and a low molecular weight poly(methyl methacrylate)

22-Sep-2016 | Keishi Naito, Akiyoshi Takeno, Ryota Morifuji, Toshiaki Miyata, Minoru Miwa, Shinya Takahashi, Journal of Applied Polymer Science, 2016

ABSTRACT Periodic crazes are caused in a polymer film by the unique mechanical method using bending. Generation of a craze depends on entanglements of the molecular chains of a polymer. Therefore, control of composite morphology of periodic crazes was attempted by varying the entanglements of ...

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