Photo- and thermal ageing of polychloroprene: Effect of carbon black and crosslinking

Delor, F.; Lacoste, J.; Lemaire, Jácques; Barrois-Oudin, N; Cardinet, C.

doi:10.1016/0141-3910(96)00097-3

Cited by 50 publications

(22 citation statements)

References 10 publications

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“…The strong band at 3310 cm − 1 represented O\ \H stretching, indicating that residual water was present in the sample. In the range 2850-3000 cm −1 , numerous bands were noted and attributed to C\ \H stretching vibration, corresponding to the symmetrical and asymmetrical stretching in the -CH 2 and -CH 3 groups (Delor, Lacoste, Lemaire, Barrois-Oudin, & Cardine, 1996;Haris & Severcan, 1999;Larkin, 2011;Mattos, Viganó, Dutra, Diniz, & Iha, 2002). The broad structure from 900 to 1200 cm −1 is due to C\ \O, C\ \C stretches and C\ \O\ \H, C\ \O\ \C deformation of bLf (Barth, 2007).…”

Section: Fourier Transform Infrared (Ftir) Spectroscopy Analysismentioning

confidence: 99%

Lactoferrin-based nanoparticles as a vehicle for iron in food applications – Development and release profile

Martins

Santos

Bourbon

et al. 2016

Food Research International

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This study aims at developing and characterizing bovine lactoferrin (bLf) nanoparticles as an iron carrier. bLf nanoparticles were characterized in terms of size, polydispersity index (PdI), electric charge (ζ-potential), morphology, structure and stability over time. Subsequently, iron release experiments were performed at different pH values (2.0 and 7.0) at 37°C, in order to understand the release mechanism. bLf (0.2%, w/v) nanoparticles were successfully produced by thermal gelation (75°C for 20min). bLf nanoparticles with 35mM FeCl showed an iron binding efficiency value of approximately 20%. The nanoparticles were stable (i.e. no significant variation of size and PdI of the nanoparticles) for 76days at 4°C and showed to be stable between 4 and 60°C and pH2 and 11. Release experiments at pH2 showed that iron release could be described by the linear superposition model (explained by Fick and relaxation phenomenon). On the contrary, the release mechanism at pH7 cannot be described by either Fick or polymer relaxation behaviour. In general, results suggested that bLf nanoparticles could be used as an iron delivery system for future food applications.

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Section: Fourier Transform Infrared (Ftir) Spectroscopy Analysismentioning

confidence: 99%

Lactoferrin-based nanoparticles as a vehicle for iron in food applications – Development and release profile

Martins

Santos

Bourbon

et al. 2016

Food Research International

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“…With the unique properties of large shear deformation, excellent energy absorption and good thermal aging resistance, neoprene rubbers are frequently used as load‐bearing and earthquake‐resistant components in many engineering structures such as bridges and buildings. However, the degradation of neoprene rubbers occurs when they are subjected to various environmental attacks1, 2 in service. For example, the deterioration caused by ultraviolet irradiation is normally observed and of concern in rubber component design in Taiwan because of its climate of relatively strong sunlight.…”

Section: Introductionmentioning

confidence: 99%

Effects of ultraviolet irradiation on the static and dynamic properties of neoprene rubbers

Chou

Huang

2008

J of Applied Polymer Sci

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Rubbers deteriorate when they are exposed to ultraviolet irradiation for long periods of time. By conducting a series of hardness measurements and simple tension tests, the static properties of neoprene rubbers before and after exposure to various durations of ultraviolet irradiation were first measured. It is found that the Shore A hardness and tensile modulus of neoprene rubbers after exposure to ultraviolet irradiation are increased but their elongation at break, tensile strength, and energy to break are significantly decreased. On the basis of a complex spring model of a vibration system, the dynamic shear properties of neoprene rubbers before and after exposure to different durations of ultraviolet irradiation were then determined from the experimental results of dynamic transmissibility tests. It is also found that the storage modulus, loss modulus, and loss factor of neoprene rubbers are drastically affected by the duration of ultraviolet irradiation they experienced.

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“…4. They display the same features as the spectra presented by Delor et al [9]. The main changes are summarized in Table 1 with the assignments and the estimated values of the corresponding molar absorptivity values used to translate absorbance values into approximate concentrations.…”

Section: Molecular Modificationsmentioning

confidence: 49%

“…It seems logical to attribute their formation, as proposed by Delor et al [9 to the oxidative attack of the carbon bearing a chlorine atom. As previously quoted, the corresponding hydroperoxides are highly unstable, their decomposition gives an a chloroalkoxyl which, according to Delor et al [9] would lead to the acid chloride by b scission. However splitting of the CeCl bond can be a competitive b scission process leading to a ketone.…”

Section: Introductionmentioning

confidence: 86%

“…The nature of stable oxidation products has been investigated by Delor et al [9] essentially on the basis of IR measurements. As expected the spectra reveal the disappearance of double bonds and the appearance of a variety of oxygen containing structures, among which acid chlorides absorbing at 1790 cm -1 of which the presence has been confirmed by derivatization (transformation into primary amine by reaction with ammonia).…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of unvulcanized, unstabilized polychloroprene: A kinetic study

Gac

Roux

Verdú

et al. 2014

Polymer Degradation and Stability

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Thermal oxidation in air at atmospheric pressure, in the 80e140 C temperature range and in oxygen at 100 C in the 0.02e3 MPa pressure range, of unvulcanized, unstabilized, unfilled polychloroprene (CR) has been characterized using FTIR and chlorine concentration measurement. The kinetic analysis was focused on double bond consumption. A mechanistic scheme involving unimolecular and bimolecular hydroperoxide decomposition, oxygen addition to alkyl radicals, hydrogen abstraction on allylic methylenes, alkyl and peroxyl additions to double bonds and terminations involving alkyl and peroxy radicals was elaborated. The corresponding rate constants were partly extracted from the literature and partly determined from experimental data using the kinetic model derived from the mechanistic scheme in an inverse approach. Among the specificities of polychloroprene, the following were revealed: The rate of double bond consumption is a hyperbolic function of oxygen pressure that allows a law previously established for the oxidation of saturated substrates to be generalized. CR oxidation is characterized by the absence of an induction period that reveals the instability of hydroperoxides. The kinetic analysis also reveals that peroxyl addition is faster than hydrogen abstraction but slower in CR than in common hydrocarbon polydienes.

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Photo- and thermal ageing of polychloroprene: Effect of carbon black and crosslinking

Cited by 50 publications

References 10 publications

Lactoferrin-based nanoparticles as a vehicle for iron in food applications – Development and release profile

Lactoferrin-based nanoparticles as a vehicle for iron in food applications – Development and release profile

Effects of ultraviolet irradiation on the static and dynamic properties of neoprene rubbers

Oxidation of unvulcanized, unstabilized polychloroprene: A kinetic study

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