Cyclization of Aryl-Aliphatic Esters with Phosphorus Pentoxide in Phosphoric Acid

Phosphorylation for the first generation product of hyperbranched polymer with terminal hydroxyl (HPAE1) was carried out to synthesize a type of P-N intumescent flame retardant （HPAE1-P）, with phosphorus pentoxide and phosphoric acid as phosphorylating agent. HPAE1-P was used in waterborne polyurethane MWU-T-502B-30, and then they were tested the properties of the emulsion, such as the stability, LOI, smoke density and vertical combustion performance. The results showed that the compatibility of this flame retardant agent and waterborne polyurethane MWU-T-502B-30 was very good, and this flame retardant agent could effectively improve the polyurethane flame retardant property.

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Control of Bacterial Wilt of Geranium with Phosphorous Acid

Plant Disease ◽

10.1094/pd-90-0798 ◽

2006 ◽

Vol 90 (6) ◽

pp. 798-802 ◽

Cited By ~ 17

Author(s):

D. J. Norman ◽

J. Chen ◽

J. M. F. Yuen ◽

A. Mangravita-Novo ◽

D. Byrne ◽

...

Keyword(s):

Phosphoric Acid ◽

Bacterial Wilt ◽

Ralstonia Solanacearum ◽

Phosphorous Acid ◽

Phosphorus Pentoxide ◽

In Vitro Growth ◽

Potassium Salts ◽

Active Portion ◽

Race 1

Various bactericides were screened for efficacy in protecting geranium plants (Pelargonium hortorum) from Ralstonia solanacearum infection. Many of these bactericides were found to slow the disease progress; however, they were not able to protect the plants from infection and subsequent death. Potassium salts of phosphorous acid were found to be effective in protecting plants from infection when applied as a drench. The active portion of the potassium salts was found to be phosphorous acid (H3PO3). Phosphorous acid was found to inhibit in vitro growth of R. solanacearum. It is thought to be protecting plants from infection by acting as a bacteriostatic compound in the soil. The plants, however, are not protected from aboveground infection on wounded surfaces. Phosphorous acid drenches were shown to protect geranium plants from infection by either race 1 or 3 of R. solanacearum. Other phosphorous-containing products commonly used in the industry, such as phosphorus pentoxide (P2O5) and phosphoric acid (H3PO4), were not able to protect plants from bacterial wilt infection.

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Source and Distribution of Phosphorus Pentoxide in Triple Superphosphate. Determination by Radioactive Phosphoric Acid.

Industrial & Engineering Chemistry ◽

10.1021/ie50518a047 ◽

1953 ◽

Vol 45 (2) ◽

pp. 418-424 ◽

Cited By ~ 1

Author(s):

G. L. Bridger ◽

J. W. Markey

Keyword(s):

Phosphoric Acid ◽

Phosphorus Pentoxide ◽

Triple Superphosphate

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Phosphorylation of Proteins with Phosphoric Acid Containing Excess Phosphorus Pentoxide

Journal of the American Chemical Society ◽

10.1021/ja01186a033 ◽

1948 ◽

Vol 70 (6) ◽

pp. 2101-2107 ◽

Cited By ~ 51

Author(s):

Robert E. Ferrel ◽

Harold S. Olcott ◽

Heinz Fraenkel-Conrat

Keyword(s):

Phosphoric Acid ◽

Phosphorus Pentoxide ◽

Phosphorylation Of Proteins

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Phosphorus pentoxide from Kazakhstan phosphorus as a base for production of polyphosphoric acids (PPA) in the cascade reactors system

Polish Journal of Chemical Technology ◽

10.2478/pjct-2019-0005 ◽

2019 ◽

Vol 21 (1) ◽

pp. 24-26

Author(s):

Damian Milde ◽

Leszek Urbańczyk ◽

Marcin Figura ◽

Wojciech Piś

Keyword(s):

Phosphoric Acid ◽

Production Process ◽

Phosphorus Pentoxide ◽

High Chemical ◽

Chemical Purity ◽

Phosphoric Acids

Abstract The polyphosphoric acids (PPA) were synthesized in a cascade reactors system from P2O5 obtained from the burning of Kazakh phosphorus. Presented system provides guidelines for the PPA production process using phosphoric acids only at concentrations above 100% (in conversion to H3PO4). Polyphosphoric acids are processed in a cascade reactors system, where the in 1st concentration of PPA is increased by addition of P2O5, while in the 2nd reactor PPA is diluted with the use of 85% phosphoric acid. Produced PPA can be obtained in the 100–118% range and is characterized by high chemical purity due to the reduction of the corrosivity of the reaction, which results in very low content of iron (below 2 ppm Fe).

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The concerted use of SEM, TEM, and SCM for examination of resin-dentin interfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100170116 ◽

1994 ◽

Vol 52 ◽

pp. 476-477

Author(s):

B. Van Meerbeek ◽

L. J. Conn ◽

E. S. Duke

Keyword(s):

Surface Layer ◽

Stress Distribution ◽

Phosphoric Acid ◽

Bonding Mechanism ◽

Restorative Dentistry ◽

Dental Adhesive ◽

Low Viscosity ◽

Dentin Adhesives ◽

Acid Etch ◽

Tooth Tissue

Restoration of decayed teeth with tooth-colored materials that can be bonded to tooth tissue has been a highly desirable property in restorative dentistry for many years. Advantages of such an adhesive restorative technique over conventional techniques using non-adhesive metal-based restoratives include improved restoration retention with minimal sacrifice of sound tooth tissue for retention purposes, superior adaptation and sealing of the restoration margins in prevention of caries recurrence, improved stress distribution across the tooth-restoration interface throughout the whole tooth, and even reinforcement of weakened tooth structures. The dental adhesive technology is rapidly changing. An efficient resin bond to enamel has already long been achieved. Its bonding mechanism has been fully elucidated and has proven to be a durable and reliable clinical treatment. However, bonding to dentin represents a greater challenge. After the failures of a dentin acid-etch technique in imitation of the enamel phosphoric-acid-etch technique and a bonding procedure based on chemical adhesion, modern dentin adhesives are currently believed to bond to dentin by a micromechanical hybridization process. This process is developed by an initial demineralization of the dentin surface layer with acid etchants exposing a collagen fibril arrangement with interfibrillar microporosities that subsequently become impregnated by low-viscosity monomers. Although the development of such a hybridization process has well been documented in the literature, questions remain with respect to parameters of-primary importance to adhesive efficacy.

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