scholarly journals Process for coating surfaces with a copolymer made from sulfur and dicyclopentadiene

2021 ◽  
Author(s):  
Maximilian Mann ◽  
Bowen Zhang ◽  
Samuel Tonkin ◽  
Christopher Gibson ◽  
Zhongfan Jia ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Metal Surface ◽  
Silica Gel ◽  
Mercury Removal ◽  
Low Molecular Weight ◽  
Water Mixture ◽  
Curing Process ◽  
Resistant Material ◽  
Corrosion Resistant ◽  
Shelf Stable

The reaction between sulfur and dicyclopentadiene was optimised to form a shelf stable and soluble low molecular weight oligomer. After a simple curing process at 140 °C the material was rendered insoluble and resistant to acids and solvents. Taking advantage of the soluble oligomer, a metal surface was coated with the dissolved material which was then cured to show that a copolymer layer can act as a corrosion resistant material. Further, silica gel was coated with the soluble oligomer to test mercury removal applications. Even after curing, the polymer coated silica was an effective mercury sorbent. Additionally, the sorbent was also used to remove mercury form a diesel and water mixture indicating that mercury removal from a mixture of organic and aqueous substances is possible with this system.

Processes for coating surfaces with a copolymer made from sulfur and dicyclopentadiene

2021 ◽  
Author(s):  
Maximilian Mann ◽  
Bowen Zhang ◽  
Samuel J. Tonkin ◽  
Christopher T Gibson ◽  
Zhongfan Jia ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Curing Process ◽  
Shelf Stable

The reaction between sulfur and dicyclopentadiene was optimised to form a shelf stable and soluble low molecular weight oligomer. After a simple curing process at 140 °C the material was...

scholarly journals Hydrolytic depolymerization of corncob lignin in the view of a bio-based rigid polyurethane foam synthesis

RSC Advances ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 6123-6130 ◽  
Author(s):  
Bai-Liang Xue ◽  
Pan-Li Huang ◽  
Yong-Chang Sun ◽  
Xin-Ping Li ◽  
Run-Cang Sun
Keyword(s):  
Molecular Weight ◽  
Polyurethane Foam ◽  
Low Molecular Weight ◽  
Water Mixture ◽  
Rigid Polyurethane Foam ◽  
Hydroxyl Number ◽  
Hydrolytic Depolymerization

Corncob lignin was efficiently depolymerized in an isopropanol–water mixture with NaOH as catalyst into bio-polyols with low molecular weight and suitable hydroxyl number in view of the preparation of a bio-based rigid polyurethane foam.

Polymeric Composites for Filling Bone Cavities

2020 ◽  
Vol 869 ◽  
pp. 419-423
Author(s):  
Dina I. Fazylova ◽  
Lubov A. Zenitova
Keyword(s):  
Molecular Weight ◽  
Composite Materials ◽  
Polymer Composite ◽  
Maxillofacial Surgery ◽  
Polymeric Composites ◽  
Polymer Composite Materials ◽  
Low Molecular Weight ◽  
Curing Process ◽  
The Creation

Polymer composite materials (PCМ) based on low molecular weight siloxane rubber SKTN-A have been developed, which are supposed to be used as osteoplastic materials in maxillofacial surgery. The following materials were used as fillers for the creation of PCM: bentonite, sepiolite, wollastanite. The effect of the type and content of filler on the curing process and the properties of the resulting compositions was investigated.

Investigating the Possibility of using PO-300 Low-molecular-weight Polyamide as a ‘Cold’ Curing Agent for Epoxy Oligomers

2017 ◽  
Vol 44 (1) ◽  
pp. 35-38
Author(s):  
A.S. Mostovoi ◽  
L.G. Panova
Keyword(s):  
Molecular Weight ◽  
Physicomechanical Properties ◽  
Low Molecular Weight ◽  
Curing Agent ◽  
Curing Process ◽  
Epoxy Oligomers

As a result of research conducted, compositions have been developed using PO-300 low-molecular-weight polyamide as the curing agent for epoxy oligomers, ensuring a reduction in the toxicity of the curing process and an increase in the physicomechanical properties.

A high-performance oil-free backing pump for electron microscopes

1978 ◽  
Vol 36 (1) ◽  
pp. 110-111
Author(s):  
G.K.W. Balkau ◽  
E. Bez ◽  
J.L. Farrant
Keyword(s):  
Molecular Weight ◽  
Electron Microscope ◽  
Hot Spots ◽  
High Performance ◽  
Carbonaceous Material ◽  
Contamination Rate ◽  
Low Molecular Weight ◽  
Principal Source ◽  
Rotary Pumps ◽  
Electron Microscopes

The earliest account of the contamination of electron microscope specimens by the deposition of carbonaceous material during electron irradiation was published in 1947 by Watson who was then working in Canada. It was soon established that this carbonaceous material is formed from organic vapours, and it is now recognized that the principal source is the oil-sealed rotary pumps which provide the backing vacuum. It has been shown that the organic vapours consist of low molecular weight fragments of oil molecules which have been degraded at hot spots produced by friction between the vanes and the surfaces on which they slide. As satisfactory oil-free pumps are unavailable, it is standard electron microscope practice to reduce the partial pressure of organic vapours in the microscope in the vicinity of the specimen by using liquid-nitrogen cooled anti-contamination devices. Traps of this type are sufficient to reduce the contamination rate to about 0.1 Å per min, which is tolerable for many investigations.

Low-molecular-weight heparin in the prevention and treatment of thromboembolic disorders

1998 ◽  
Vol 1 (5) ◽  
pp. 166-174 ◽  
Author(s):  
Evelyn R Hermes De Santis ◽  
Betsy S Laumeister ◽  
Vidhu Bansal ◽  
Vandana Kataria ◽  
Preeti Loomba ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight Heparin ◽  
Low Molecular Weight ◽  
Prevention And Treatment
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