Hydrolytic degradation mechanism of Kevlar 49 fibers when dissolved in sulfuric acid

Morgan, Roger J.; Butler, N.

doi:10.1007/bf00297440

Cited by 21 publications

(15 citation statements)

References 9 publications

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“…Polymers can also be dissolved in liquid crystalline solvents and form lyotropic phases [60]. Also, stiff polymers can be dissolved and form lyotropic liquid crystalline phases, with the most famous example being Kevlar ® dissolved in sulfuric acid [61]. Of course, polymer networks cannot be dissolved, but can only be swollen to different degrees.…”

Section: Philicities/phobicities In Polymeric Systemsmentioning

confidence: 99%

Polyphilicity—An Extension of the Concept of Amphiphilicity in Polymers

2018

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Recent developments in synthetic pathways as simple reversible-deactivation radical polymerization (RDRP) techniques and quantitative post-polymerization reactions, most notoriously ‘click’ reactions, leading to segmented copolymers, have broadened the molecular architectures accessible to polymer chemists as a matter of routine. Segments can be blocks, grafted chains, branchings, telechelic end-groups, covalently attached nanoparticles, nanodomains in networks, even sequences of random copolymers, and so on. In this review, we describe the variety of the segmented synthetic copolymers landscape from the point of view of their chemical affinity, or synonymous philicity, in bulk or with their surroundings, such as solvents, permeant gases, and solid surfaces. We focus on recent contributions, current trends, and perspectives regarding polyphilic copolymers, which have, in addition to hydrophilic and lipophilic segments, other philicities, for example, towards solvents, fluorophilic entities, ions, silicones, metals, nanoparticles, and liquid crystalline moieties.

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Section: Philicities/phobicities In Polymeric Systemsmentioning

confidence: 99%

Polyphilicity—An Extension of the Concept of Amphiphilicity in Polymers

2018

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“…For this reason it is commonly used to identify the functional groups present in polymers [19][20][21][22][23][24][25]. The pure polymers together with MF and F were studied by means of FTIR to see if the bands characteristic of pure polymers are present in MF and F. Table S2 displays the band assignment used to identify the characteristic bands.…”

Section: Infrared Spectroscopy Of Fibresmentioning

confidence: 99%

Identification of polymers in waste tyre reinforcing fibre by thermal analysis and pyrolysis

Acevedo

Fernández

Barriocanal

2015

Journal of Analytical and Applied Pyrolysis

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The composition of the reinforcing fibre obtained from the recycling of scrap tyres was analyzed with a view to finding the most suitable applications for it. The material (RF) was separated into two different parts i.e. fibre (F) and microfibre (MF) to ensure the maximum homogeneity of the material under study. Thermogravimetric analysis (TG) together with differential scanning calorimetry (DSC) and infrared spectroscopy (FTIR) were used to identify the polymers present in the waste and to determine in what proportions they were present. Determination of the temperatures of maximum volatile matter evolution (Tmax), the yield at the end of the pyrolysis and the melting temperatures yielded very useful results for the identification of the polymers. In order to confirm the results obtained, pyrolysis of the pure polymers was carried out and the decomposition products were analysed. The results were then compared with the oil composition data derived from the pyrolysis of the waste fibres. Our results showed the presence of two polyamides, rayon, polyester and aramid.

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“…A proposed mechanism for the hydrolysis leading to chain scission of PPTA is given in Fig. 4 [18,19]. The main purpose of this study is to ascertain whether or not the degradation of PBO due to environmental conditioning results in complete (leading to chain scission, Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Chemical structure of PPTA[18,20,21]. Proposed mechanism of hydrolysis for PBO with chain scission [4e17,22,23].…”

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confidence: 99%