This thesis aims to explore an aspect of the history of vernacular speech through analysis of some eighteenth century verse texts. These satirical anti-Jesuit pamphlets by Nicolas Jouin, known as the 'Sarcelades', were collected posthumously in 'Le Vrai Recueil des Sarcelles' of 1764. The texts purport to be in the patois of the peasants of Sarcelles and show features which may be paralleled in the vernacular speech of Paris and elsewhere, and even correspond with features of contemporary colloquial French. The study may appeal to French historical sociolinguists interested in reconstructing spoken language of the past, and particularly in the history of vernacular speech of Paris since the Middle Ages through to the eighteenth century, in the context of the development of urban dialects. In order to set the scene for a linguistic description of Jouin’s work the limited biographical information available was collated. Then a period of bibliographical research led to acquisition of copies of the texts which were to be studied in order to identify and examine their non-standard linguistic features. Firstly the process of growth of urban dialects was discussed, and then the development of the Paris vernacular in particular. Then attention was turned to direct written evidence in the form of commentary and to a number of texts from the sixteenth to eighteenth centuries containing features of the Paris vernacular. These had already been analysed by certain historical linguists, although the texts in the 'Sarcelades' had hitherto only been briefly mentioned. However, here they are considered to be of sufficient interest to be examined more closely, although it had to be established whether Jouin’s texts containing a selection of non-standard features could be regarded as an accurate depiction of the Paris vernacular at the period. The non-standard phonetic, morphological, syntactic, and lexical features in the texts were therefore compared with findings in other texts by previous commentators. Following these analyses it was noted to what extent the relative frequency of the variables correlates with the salience of certain features in popular speech in Paris at the period, as already observed in other texts by previous commentators, and it was concluded that in general established characteristics of the 'patois de Paris' at the period are to be found in the 'Sarcelades', even though there do remain certain features which do not appear to be generally attested elsewhere. Nevertheless, despite reservations concerning the authenticity of some of the non-standard features employed by Jouin, by bringing attention to this little-known series of texts this study may help to claim a place for the Sarcelades amongst the corpus of texts which reflect aspects of the lower-class sociolect, the 'patois de Paris', at the period.

Selon leur formulation et leur mise en forme et grâce à leur complexité microstructurale induite, les polymères thermoplastiques bénéficient d’une grande diversité de propriétés thermomécaniques. Cependant, l’évolution de la microstructure de ces matériaux au cours de leur utilisation reste difficile à identifier. Afin de mieux comprendre les modifications microstructurales ayant lieu au cours de sollicitations thermomécaniques, différentes techniques non destructives de caractérisation en temps réel et in situ ont été développées. Dans ce contexte, un Poly (Ethylène Téréphtalate) (PET) amorphe et semi-cristallin a été étudié afin de mettre en évidence l’effet de la microstructure sur les propriétés macroscopiques du matériau. Pour ce faire, plusieurs couplages de techniques expérimentales de caractérisation ont été mis en œuvre tels que la spectroscopie Raman et la diffraction/diffusion des rayons X couplées au système de VidéoTraction™ ou la spectroscopie Raman couplée à la calorimétrie différentielle à balayage (DSC) pour une caractérisation des micromécanismes de déformation et du comportement thermique du matériau respectivement. Le suivi de différentes bandes vibrationnelles judicieusement identifiées a permis d’établir un nouveau critère robuste et capable de mesurer avec exactitude le taux de cristallinité du matériau ou de remonter aux températures caractéristiques de sa morphologie (Tg, Tc, Tcc, Tf) grâce aux informations extraites d’un spectre Raman. De plus, un système de caractérisation relaxationnelle par un couplage de la spectroscopie diélectrique dynamique avec un essai de traction a été utilisé afin de mettre en évidence l’effet de la mobilité moléculaire sur la déformation élasto-visco-plastique du PET. D’un point de vue mécanique, les principaux micromécanismes de déformation ont été étudiés en temps réel pendant un essai de traction à différentes températures et vitesses de déformation vraies constantes : l’orientation macromoléculaire, l’endommagement volumique, le développement de mésophase et la cristallisation induite sous contrainte, ont été observés et quantifiés in situ en utilisant les couplages précédents au synchrotron Petra III de Hambourg et au synchrotron Elettra de Trieste. En parallèle, une étude de la mobilité moléculaire (paramètre déterminant à la prédominance de tel ou tel micromécanisme de déformation) a été menée via des analyses relaxationnelles réalisées au cours de la déformation du matériau. En complément, des expériences en temps réel, des études post mortem par les techniques précédemment citées et par radiographie X, microscopie électronique à balayage et tomographie X ont été réalisées afin d’apprécier l’influence de la relaxation mécanique du PET. / According to their formulations and forming processes and thanks to the complexity of their induced microstructure, thermoplastic polymers show a wide range of thermomechanical properties. However, the identification of the evolution of the microstructure of these materials during their use remains difficult. To better understand the microstructural changes occurring during thermomechanical loadings, various in situ and non-destructive techniques of characterization have been used. In this context, a Poly (Ethylene Terephthalate) (PET) amorphous and semi-crystalline was studied in order to highlight the effect of the microstructure on the macroscopic properties of the material. This way, different coupling systems combining several experimental characterization techniques have been implemented such as Raman spectroscopy and X-rays diffraction/scattering coupled to the VidéoTraction™ system or Raman spectroscopy coupled with differential scanning calorimetry (DSC) for the characterization of the deformation micro-mechanisms and the thermal behavior of the material respectively. Monitoring specific vibrational bands thoroughly identified allowed the establishment of a new robust criterion which enables to accurately measure the crystallinity ratio of the material and the identification of the characteristic temperatures of its morphology (Tg, Tc, Tcc, Tm). In addition, a relaxational characterization system by coupling dynamic dielectric spectroscopy to a tensile test has been used in order to highlight the effect of molecular mobility on the elasto-visco-plastic deformation of PET. From a mechanical point of view, the main deformation micro-mechanisms have been studied in real time during a tensile test at different temperatures and constant true strain rates: macromolecular orientation, volume damage, development of mesophase and strain induced crystallization were observed and quantified in situ using the coupled characterization technics presented previously at Petra III (Hambourg) and Elettra (Trieste) synchrotrons. In parallel, a study of the molecular mobility (a determining parameter for the predominance of one deformation micromechanism to another) was conducted via relaxational analysis performed during the deformation of the material. In addition to in situ experiments, post mortem analysis by the previously mentioned technics and by X radiography, scanning electron microscopy and X tomography were performed to assess the influence of the mechanical relaxation of the polymer.