Hydrolysis of aromatic heterocyclic polymers in high temperature water. I. Hydrolysis of polyphenyl‐1,2,4‐triazine

Yi, Xiaobing; Wu, Guan-Wei; Lu, Fang; Tang, An‐Na

doi:10.1002/app.1922

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…Such reactions are commonly implemented in industry for animal fat and vegetable oil splitting . Additionally, hydrolysis in HTW has been investigated for many other applications such as coal liquefaction, biorefineries, and waste polymer recycling. − …”

Section: Introductionmentioning

confidence: 99%

Effect of pH on Ether, Ester, and Carbonate Hydrolysis in High-Temperature Water

Comisar

Hunter

Walton

et al. 2007

Ind. Eng. Chem. Res.

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We examined the hydrolysis of dibenzyl ether, benzyl t-butyl ether, methyl t-butyl ether, methylbenzoate, and diphenylcarbonate in high-temperature liquid water, both with and without added acid or base. The apparent reaction order for H+ did not exceed 0.2 for any of the compounds investigated. This result indicates that hydrolysis of these compounds in high-temperature water (HTW) does not follow the kinetics expected for specific acid catalysis (H+ reaction order = 1.0), as does the hydrolysis at ambient temperatures. Rather, the greater thermal energy in the HTW system allows protonation by water molecules to become faster than protonation by H+ at near-neutral conditions. Because the water-catalyzed path is faster, the occurrence of these acid-catalyzed reactions in HTW with no added acid is not due to the elevated value of K w, the ion product. This finding contradicts the conventional wisdom in this field.

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Section: Introductionmentioning

confidence: 99%

Effect of pH on Ether, Ester, and Carbonate Hydrolysis in High-Temperature Water

Comisar

Hunter

Walton

et al. 2007

Ind. Eng. Chem. Res.

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“…In case of poly(phenyl-1,2,4-triazine), polymer degradation was observed at the reported conditions due to cleavage of one C-N bond and further hydrolysis. 212 Furthermore, the auto-polymerization of styrene in NCW was investigated, revealing that polymers with similar molar masses (M n B 37 000 Da) were obtained with different water to styrene ratios, indicating that styrene was not soluble under the investigated conditions, and therefore the polymerization occurred most likely as a phase-separated bulk polymerization. 213…”

Section: Near-critical Water In Polymer Chemistrymentioning

confidence: 99%

Recent developments in the utilization of green solvents in polymer chemistry

et al. 2010

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The use of solvents produces the largest amount of auxiliary waste in polymer science. Due to the fact that sustainable chemistry is becoming more and more important in polymer research, alternative reaction media have been investigated in order to reduce or replace the use of organic solvents. The most commonly used green solvents in polymer chemistry are water, supercritical carbon dioxide and ionic liquids. The progress of utilizing these green solvents in polymerization processes is reviewed and discussed in this critical review on the basis of results mainly published during the last five years (216 references).

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“…Additionally, Krzysztof et al [ 100 ] improved the conventional and thermal properties of asphalt by blending waste LDPE, ground tire rubber (GTR), and elastomer. Other studies have reported that waste plastics can be mixed with some common materials such as sulfur [ 101 , 102 ], carbon black [ 103 ], and polyphosphoric acid [ 104 , 105 ] as asphalt modifiers.…”

Section: The Use Of Waste Plastics In Asphaltmentioning

confidence: 99%

Using Waste Plastics as Asphalt Modifier: A Review

Zhao

2021

Materials

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The use of waste products in the production of asphalt binders and asphalt mixtures has become widespread due to economic and environmental benefits. In particular, the use of recycled waste plastic in asphalt binders and mixtures is gaining more attention. This review presents analyses and comparisons of various forms of waste plastic used in asphalt modification, and approaches to incorporating waste plastic into asphalt mixtures, both for single and composite modifications. It focuses on the properties of waste plastics, asphalt binders, and asphalt mixtures. Overall, the incorporation of plastic waste into asphalt mixtures can significantly improve high-temperature performance and has potential economic and environmental benefits. The performance of modified asphalt is highly dependent on multiple factors, such as waste sources, waste plastic dosages, blending conditions, and the pretreatment methods for waste plastic. There are different ways to apply waste plastics to blend into a mixture. In addition, this paper discusses the current challenges for waste plastic-modified asphalt, including the stability, low-temperature performance, modification mechanism, and laboratory problems of the blends. The use of chemical methods, such as additives and functionalization, is considered an effective way to achieve better interactions between waste plastics and the binder, as well as achieving a higher sufficiency utilization rate of waste plastics. Although both methods provide alternative options to produce waste plastic-modified asphalt with stability and high performance, the optimal proportion of materials used in the blends and the microcosmic mechanism of composite modified asphalt are not clear, and should be explored further.

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Hydrolysis of aromatic heterocyclic polymers in high temperature water. I. Hydrolysis of polyphenyl‐1,2,4‐triazine

Cited by 4 publications

References 35 publications

Effect of pH on Ether, Ester, and Carbonate Hydrolysis in High-Temperature Water

Effect of pH on Ether, Ester, and Carbonate Hydrolysis in High-Temperature Water

Recent developments in the utilization of green solvents in polymer chemistry

Using Waste Plastics as Asphalt Modifier: A Review

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