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 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.

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

Venous thromboembolism in a general hospital. An update with low molecular weight heparin prophylaxis

VASA ◽  
2007 ◽  
Vol 36 (1) ◽  
pp. 17-22
Author(s):  
Schulz ◽  
Kesselring ◽  
Seeberger ◽  
Andresen
Keyword(s):  
Molecular Weight ◽  
Pulmonary Embolism ◽  
Venous Thromboembolism ◽  
Low Molecular Weight ◽  
Trauma Patients ◽  
Vte Prophylaxis ◽  
Vein Thrombosis ◽  
Patients At Risk ◽  
Hospital Stays ◽  
Event Rates

Background: Patients admitted to hospital for surgery or acute medical illnesses have a high risk for venous thromboembolism (VTE). Today’s widespread use of low molecular weight heparins (LMWH) for VTE prophylaxis is supposed to have reduced VTE rates substantially. However, data concerning the overall effectiveness of LMWH prophylaxis is sparse. Patients and methods: We prospectively studied all patients with symptomatic and objectively confirmed VTE seen in our hospital over a three year period. Event rates in different wards were analysed and compared. VTE prophylaxis with Enoxaparin was given to all patients at risk during their hospital stay. Results: A total of 50 464 inpatients were treated during the study period. 461 examinations were carried out for symptoms suggestive of VTE and yielded 89 positive results in 85 patients. Seventy eight patients were found to have deep vein thrombosis, 7 had pulmonary embolism, and 4 had both deep venous thrombosis and pulmonary embolism. The overall in hospital VTE event rate was 0.17%. The rate decreased during the study period from 0.22 in year one to 0,16 in year two and 0.13 % in year three. It ranged highest in neurologic and trauma patients (0.32%) and lowest (0.08%) in gynecology-obstetrics. Conclusions: With a simple and strictly applied regimen of prophylaxis with LMWH the overall rate of symptomatic VTE was very low in our hospitalized patients. Beside LMWH prophylaxis, shortening hospital stays and substantial improvements in surgical and anasthesia techniques achieved during the last decades probably play an essential role in decreasing VTE rates.

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