Effect of variations of CuIIX2/L, surface area of Cu0, solvent, and temperature on atom transfer radical polyaddition of 4-vinylbenzyl 2-bromo-2-isobutyrate inimers

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51816-51822 ◽  
Author(s):  
Chih-Feng Huang ◽  
Shiao-Wei Kuo ◽  
Daniela Moravčíková ◽  
Jyun-Ci Liao ◽  
Yu-Min Han ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Surface Area ◽  
Atom Transfer ◽  
Catalytic Systems

Optimization of atom transfer radical polyadditions using commercially available catalytic systems allowed obtaining control over the polyester architecture and functionality and functional linear polyesters with high molecular weight (Mw = 16 200).

Mixing of Carbon Black with Rubber. VI. Analysis of NR/SBR Blends

1988 ◽  
Vol 61 (4) ◽  
pp. 609-618 ◽  
Author(s):  
George R. Cotten ◽  
Lawrence J. Murphy
Keyword(s):  
Molecular Weight ◽  
Carbon Black ◽  
High Molecular Weight ◽  
Surface Area ◽  
Bound Rubber ◽  
Very High

Abstract The distribution of carbon black in NR/SBR blends was determined through the analysis of bound rubber. The NR/SBR blends were found to be very different from the previously studied SBR/BR compounds: these differences were assigned to mutual insolubility of the two polymers and a very high molecular weight of NR. In NR/SBR blends, it was found that changes in molecular weight of the polymer has no effect on the carbon black distribution in the blend. While the “activity” of carbon black did not affect the distribution, the loading of the black in NR decreased linearly with increasing surface area of the black. Approximately 35% of normal tread blacks (surface area 80–100 m2/g) was found in the NR phase. However, the bond between NR and carbon black is quite weak, and black continues to migrate into the SBR phase on prolonged mixing or during blending of NR and SBR masterbatches.

High-molecular-weight polyacrylonitrile by atom transfer radical polymerization

2006 ◽  
Vol 100 (4) ◽  
pp. 3372-3376 ◽  
Author(s):  
Chen Hou ◽  
Rongjun Qu ◽  
Junshen Liu ◽  
Liang Ying ◽  
Chengguo Wang
Keyword(s):  
Molecular Weight ◽  
Atom Transfer Radical Polymerization ◽  
High Molecular Weight ◽  
Radical Polymerization ◽  
Atom Transfer

Graft copolymers and high-molecular-weight star-like polymers by atom transfer radical polymerization

2006 ◽  
Vol 100 (5) ◽  
pp. 3662-3672 ◽  
Author(s):  
Bohumil Masař ◽  
Miroslav Janata ◽  
Petra Látalová ◽  
Miloš Netopilík ◽  
Petr Vlček ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Atom Transfer Radical Polymerization ◽  
High Molecular Weight ◽  
Radical Polymerization ◽  
Graft Copolymers ◽  
Atom Transfer

scholarly journals Effect of Cellulose Characteristics on the Properties of the Wet-Spun Aerogel Fibers

2021 ◽  
Vol 11 (4) ◽  
pp. 1525
Author(s):  
Matin Rostamitabar ◽  
Gunnar Seide ◽  
Stefan Jockenhoevel ◽  
Samaneh Ghazanfari
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Surface Area ◽  
Biomedical Application ◽  
Wound Care ◽  
Textural Properties ◽  
High Specific Surface Area ◽  
Fiber Spinning ◽  
Limiting Factor ◽  
High Porosity

Cellulose aerogels (CAs) from plant or bacterial-derived cellulose have advantages such as low density, high porosity, and high specific surface area and have been used in various applications including biomedical fields. One limiting factor in developing CAs is their demanding shaping process since it involves several steps of dissolution/dispersion of cellulose, geometry configurations using molds or nozzles, coagulation and washing of the gel body, and drying techniques. CA fibers can be converted into textiles and enhance the design ability, stiffness, and flexibility of the CAs. This study aims to understand the correlations between the initial cellulose characteristics, aerogel’s internal structure, and its prospective biomedical application. Wet-spun CA fibers were obtained by supercritical CO2 drying from low and high molecular weight microcrystalline cellulose in calcium thiocyanate tetrahydrate solution. Fiber spinning, thermal behavior, textural properties, and biological assessments of the CA fibers were inspected. The CA microfibers from high molecular weight cellulose proved to have a higher surface area (~197 m2/g), denser structure, and finer nanofibrils (~2 nm) with better thermal stability in comparison with the fibers produced from low molecular weight cellulose. The fibers were nontoxic, and cell proliferation was observed over time. CA fibers showed promising results to be used for biomedical applications such as tissue engineering and wound care.

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