3 edition of Further studies on the softening of rigid PVC by aqueous solutions of organic solvents found in the catalog.
Further studies on the softening of rigid PVC by aqueous solutions of organic solvents
L. V. Parker
by U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, Available from NTIS in [Hanover, N.H.], [Springfield, Va
Written in English
|Statement||Louise V. Parker and Thomas A. Ranney ; prepared for U.S. Army Environmental Center.|
|Series||Special report -- 96-26., Special report (Cold Regions Research and Engineering Laboratory (U.S.)) -- 96-26.|
|Contributions||Ranney, Thomas A., U.S. Army Environmental Center., Cold Regions Research and Engineering Laboratory (U.S.)|
|The Physical Object|
|Pagination||iv, 22 p. :|
|Number of Pages||22|
Polyvinyl chloride (PVC) homopolymer is a semi-crystalline polymer with a relatively high room temperature tensile modulus of to MPa (– psi), depending on formulation) that can be lowered by plasticizing entities to produce semi-rigid and flexible items. PVC is better known as bineel (vinyl) in Japan. This is due to the fact that PVC products, in the form of films or sheets, were widely used among the public after World War II, and these products were simply called bineel. When these PVC products that are soft to the touch first landed Japan, where only rigid.
Mao, Feng, "Permeation of hydrocarbons through polyvinyl chloride (PVC) and polyethylene (PE) pipes and pipe gaskets" (). Retrospective Theses and Dissertations. Bisphenol A (BPA) is an organic synthetic compound with the chemical formula (CH 3) 2 C(C 6 H 4 OH) 2 belonging to the group of diphenylmethane derivatives and bisphenols, with two hydroxyphenyl is a colorless solid that is soluble in organic solvents, but poorly soluble in water ( wt % at 83 °C).. BPA is a precursor to important plastics, primarily certain polycarbonates and.
However, Berens () demonstrated that PVC may soften and allow permeation of organic compounds if exposed to nearly undiluted solvents or swelling agents for PVC. For this reason, PVC well casing should be avoided under these conditions. PVC materials may also react with some trace metals. Start studying Aqueous Solutions & Properties. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
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Further studies on the softening of rigid PVC by aqueous solutions of organic solvents. [Hanover, N.H.]: U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory ; [Springfield, Va.]: [Available from NTIS],  (OCoLC) Material Type: Government publication, National government publication, Internet resource.
Home > Cold Research and Engineering Laboratory Reports > > Additional Studies on the Softening of Rigid PVC by Aqueous Solutions of Organic Solvents Table 1. Equilibrium swelling and interaction parameters for PVCorganic liquid systems. Softening of rigid PVC by aqueous solutions of organic solvents.
[L V Parker; Thomas A Ranney; U.S. Army Environmental Center.] formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be. Additional studies on the softening of rigid PVC by aqueous solutions of organic solvents.
[Hanover, N.H.]: US Army Corps of Engineers, Cold Regions Research and Engineering Laboratory ; [Springfield, VA]: [Available from NTIS],  (OCoLC) Material Type: Government publication, National government publication, Internet resource.
Get this from a library. Softening of rigid PVC by aqueous solutions of organic solvents. [L V Parker; Thomas A Ranney; Cold Regions Research and Engineering Laboratory (U.S.)]. Furthermore, the permeability coefficient, P (ML −1 T −1), of the organic solvents in the PVC pipe wall was determined as follows: (2) P = J s L where L is the thickness of the PVC pipe wall, i.e.
For the test solvents of this study, the order of permeability coefficients (μg/cm/h) from highest to lowest were benzene ( An experimental study on the mechanism of the anesthetic effect of organic solvents studied with differe Softening of rigid PVC by aqueous solutions of organic solvents [microform] / Louise V.
Parker and Thoma Additional studies on the softening of rigid PVC by aqueous solutions of organic solvents / Louise V. This study examined whether an aqueous solution that contained 18 organic chemicals that are either solvents or good swelling agents of PVC are able to cause softening when combined in a solution.
Common cleaning methods with organic solvents or aqueous solutions could lead to undesirable physicochemical changes in the paint in the long term, though the extent of this effect is not yet clear. Such membrane system can reduce dependence on hazardous techniques.
A number of studies carried out using BLM, ELM, and SLMs have been discussed in the previous sections, depicting the transport of organic molecules from aqueous solutions. Thiourea is a fertilizer, which is used to improve the yield of crops. Experimental work done by Mao et al.
() showed that PVC pipe material was permeated by benzene and toluene under extremely contaminated situations when exposed to vapors and aqueous solutions. Further studies on the softening of rigid PVC by aqueous solutions of organic solvents / Louise V.
Parke Writing job specifications (clerical): a self-instruction manual / prepared by. This study also looked at the effect of a mixture of several organic solvents dissolved in an aqueous solution. A solution that contained three good PVC swelling agents, each at an activity of Polyvinyl Chloride for Prototype Development on CNC Machines, 3D Printers, & Injection Molding Machines: There are two main issues working with PVC that make it fairly problematic and not generally recommended for use by non-professionals.
The first is the emission of toxic and corrosive gases when melting the material. PVC flooring and other PVC products can contribute to poorer indoor air quality as PVC products can off gas chemicals called volatile organic compounds (VOCs). A study by the California Air Resources Board found forty chemicals, some of which are toxic, off-gassing from PVC flooring xxii.
Usage of PVC has grown steadily since its introduction in the early s to become a very widely used plastic in a myriad of uses from films and mouldings to extruded pipe. PVC has excellent resistance to water and aqueous solutions, but it is attacked severely by stronger solvents such as aromatic hydrocarbons, ketones, esters and chlorinated.
Polyvinyl chloride (PVC) possesses a large surface area, superior physicochemical stabilities particularly in basic media, and concentrated acidic and organic solvents for a period of time. Additionally, the surface of PVC can be tailored by sorbent to.
Further studies on the softening of rigid PVC by aqueous solutions of organic solvents. U.S. Army Corps of Engineers. Cold Regions Research and Engineering Laboratory. Special report Peppas, N. A., and E. l Determination of interaction parameter χ1 for poly (vinyl alcohol) and water in gels crosslinked from.
For varnish removal, cotton swabs with organic solvents such as acetone, ethanol and hexanes are commonly used, whereas aqueous solutions with additives are mostly used to remove surface dirt. The growing corpus of scientific literature dealing with the physicochemical aspects of oil paint alterations has shed new light on the possible unwanted.
Expanded PVC (expanded polyvinyl chloride) is a lightweight, yet rigid, expanded foam polyvinyl chloride. It is tough and versatile for many visual merchandising and signage applications.
Expanded PVC, available in a wide variety of colors, is a good substrate for digital and screen printing, painting, laminating, vinyl lettering, and. In organic solvents, the pyrene pendants were found as monomers which would form excimer by diffusional encounters, whereas they formed aggregates in aqueous solutions.
In all studies, the presence of pyrene aggregates was established from a P A value lower thanthe observation of a shift between the monomer and excimer excitation spectra. Studies of the effect of water on photodegradation of PVC samples were also conducted in a closed loop photoreactor which permits measurement of CO 2 evolved.
16 Relative humidity was controlled by salt solutions and bypass control. 16 At very low humidity, the CO 2 evolution rate from PVC was low, but increased to a peak at around 35% relative.prised of low molecular weight petroleum products or organic solvents or their vapors. Research has documented that pipe materials, such as polyethylene, polybutylene, polyvinyl chloride, and asbestos cement, and elastomers, such as those used in jointing gaskets and packing glands, may be subject to permeation by lower molecular weight.