Prepolymer dianhydrides

A process for preparing dianhydrides that are miscible with hydroxyl prepolymers at moderate temperatures and can cure hydroxyl prepolymers to elastomers at moderate temperatures is disclosed. The dianhydrides are prepared by solution reaction of a prepolymer diol with excess hydride followed by removal of unreacted dianhydride. The prepolymer dianhydrides are miscible with hydroxyl substituted hydrocarbon prepolymers and cure the prepolymers to polyester-linked elastomers

New polymer systems: Chain extension by dianhydrides

Three anhydrides provide effective chain extension of hydroxy-terminated polyalkylene oxides and polybutadienes. Novel feature of these anhydride reactants is that they are difunctional as anhydrides, but they are tetrafunctional if conditions are selected that lead to total esterification or reaction of all carboxyl groups

Curable liquid hydrocarbon prepolymers containing hydroxyl groups and process for producing same

Production of hydroxyl containing curable liquid hydrocarbon prepolymers by ozonizing a high molecular weight saturated hydrocarbon polymer such as polyisobutylene or ethylene propylene rubber is discussed. The ozonized material is reduced using reducing agents, preferably diisobutyl aluminum hydride, to form the hydroxyl containing liquid prepolymers having a substantially lower molecular weight than the parent polymer. The resulting curable liquid hydroxyl containing prepolymers can be poured into a mold and readily cured, with reactants such as toluene diisocyanate, to produce highly stable elastomers having a variety of uses such as binders for solid propellants

Liquid ethylene-propylene copolymers

Oligomers are prepared by heating solid ethylene-propylene rubber in container that retains solid and permits liquid product to flow out as it is formed. Molecular weight and viscosity of liquids can be predetermined by process temperature. Copolymers have low viscosity for given molecular weight

A combined SNIFTIRS and XANES study of electrically polarised copper electrodes in DMSO and DMF solutions of cyanate (NCO⁻), thiocyanate (NCS⁻) and selenocyanate (NCSe⁻) ions

A SNIFTIRS (subtractively normalized interfacial Fourier transform infrared spectroscopy) and X-ray absorption spectroscopy (XAS) study of electrically polarized copper electrodes in six polar aprotic solvent-based systems is presented. In the systems investigated, i.e. dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) solutions containing pseudohalide species of cyanate (NCO⁻), thiocyanate (NCS⁻) and selenocyanate (NCSe⁻) codissolved with tetrabutylammonium perchlorate (TBAP), Cu was found to dissolve over a wide range of potentials to produce the corresponding Cu(I) pseudohalide and/or Cu(II) pseudohalide complex ion species. Insoluble deposited films were also observed at higher anodic applied potentials, thought to be CuSCN in the Cu/NCS⁻/DMSO or DMF systems, and solid K(SeCN)₃ in the Cu/NCSe⁻/DMSO or DMF systems respectively. The presence of the Cu(II) and/or Cu(I) oxidation states in complexes formed by polarization in Cu/pseudohalide ion systems in DMSO was clearly proven using XAS of cell solutions sampled after SNIFTIRS/electrical polarization experiments. In addition, Fourier transform infrared (FTIR) and X-ray absorption near edge spectroscopy (XANES) data obtained from model solutions prepared from mixing Cu(I) and/or Cu(II) salts with the respective pseudohalide ions in DMF and DMSO confirmed the speciation observed in the electrochemical experiments

Anodically polarized nickel electrodes in DMSO or DMF solutions of pseudohalide ions: IR spectroelectrochemical studies

A novel subtractively normalized interfacial Fourier transform infrared spectroscopic (SNIFTIRS) investigation of anodically polarized nickel electrodes in pseudohalide-containing DMF or DMSO solutions (i.e. OCN⁻, SCN⁻, SeCN⁻), in supporting electrolyte, tetrabutylammonium perchlorate (TBAP), is presented. In general, the data showed that nickel demonstrated irreversible anodic dissolution in all solutions studied at very high values of the applied potential, > +500 mV (AgCl/Ag). The predominant speciation of nickel in these systems was as complex ions consisting of Ni²⁺ ion complexed to pseudohalide ions and solvent molecules. Insoluble films and dissolved CO₂ were also detected, though mostly in the Ni/OCN⁻ systems studied. Ni(II)/pseudohalide complex ion species detected were modeled using solutions containing Ni²⁺ ion mixed with pseudohalide ion in different mole ratios. In general, the Ni/OCN⁻ electrochemical system behaved differently relative to those of Ni/SCN⁻ and Ni/SeCN⁻ due to the difference in colors observed in cell solutions after SNIFTIRS experiments which was mirrored in the model solutions. Ni(II)-cyanate species had a different, coordination geometry and gave a characteristic bright blue color due possibly to Ni(NCO)₄²⁻ ion while Ni(II) thiocyanate and selenocyanate complex ion species had octahedral coordination geometries containing solvent and one coordinated pseudohalide ion and formed greeny yellow solutions

\u27Pleonexia\u27: A Modern Pathology of Self

This study is an examination of the compulsion to shop or acquire commodities seen as a culturally and historically distinctive pathology of the modern self. The Greek term \u27pleonexia\u27 (\u27acquisitiveness\u27) is borrowed as a covenient and more accurately descriptive term than the common \u27shopaholic\u27. Pleonexia is seen as a complex, habitual, impulsive behavior which attempts to maintain order and continuity in the sense of self. Pleonexia represents a failure in self­cohesion, an attempt to counter feelings of emptiness created by the fragmentation and objectification of desire in our commodity culture. Such internal functions as regulation of feelings, self-esteem, as well as non-harmful techniques of self-soothing are what become pathological in the pleonexic. The question of personal freedom of action is central to the analysis. In chapter one, it is the question of possible external coercion -- that is, manufactured desire, or what is labeled \u27the manipulationist thesis\u27. In chapter two, the issue of internal compulsion or appetitive internal forces is seen as Freud\u27s major revolutionary contribution to a new (and much more complex) theory of action and desire. Trapped in a consumption pattern where coercion and desire correspond, the pleonexic has a frozen behavior pattern of insatiable craving. It is argued that this heteronomy is best seen as a directed disposition to acquire; and, the analysis of character traits, therefore, plays an essential role in its understanding. The concluding chapter utilizes the format of DSM-IIIR as a convenient framework to offer some observations on the diagnostic criteria, predisposing factors, associated features, impairments and differential diagnosis of this disorder. These findings are necessarily highly tentative based on the virtual silence in the psychiatric literature since the pioneering studies of Freud\u27s early followers. The thesis concludes with some observations on the implications for social work practice; borrowing from the \u27life-model\u27 and feminist treatment approaches

A Bilingual Thesaurus of Everyday Life in Medieval England: Some Issues at the Interface of Semantics and Lexicography

This paper reports on issues at the interface between semantics and lexicography that arose out of the data collection and classification of vocabulary in Anglo-Norman and Middle English in order to create a bilingual thesaurus of everyday life in medieval England. The Bilingual Thesaurus project is based at Birmingham City University and the University of Westminster. Issues to be resolved included the definition of an occupational domain; the creation of a methodology of data collection; the delimitation of domain-specific vocabulary; making distinctions between sense and usage; and the categorisation of the lexical items. Some of these issues are general to thesaurus-making, some are specific to the making of historical thesauruses, while some are unique to the production of a thesaurus of two languages whose use overlapped for several centuries in the late medieval period in England

Lexical Borrowing in the Middle English period: A multi-domain analysis of semantic outcomes

The Middle English period is well known as one of widespread lexical borrowing from French and Latin, and scholarly accounts traditionally assume that this influx of loanwords caused many native terms to shift in sense or to drop out of use entirely. The study analyses an extensive dataset, tracking patterns in lexical retention, replacement and semantic change, and comparing long-term outcomes for both native and non-native words. Our results challenge the conventional view of competition between existing terms and foreign incomers. They show that there were far fewer instances of relexification, and far more of synonymy, during the Middle English period than might have been expected. When retention rates for words first attested between 1100-1500 are compared, it is loanwords, not native terms, which are more likely to become obsolete at any point up to the nineteenth century. Furthermore, proportions of outcomes involving narrowing and broadening (often considered common outcomes following the arrival of a co-hyponym in a semantic space) were low in the Middle English period, regardless of language of origin

Lone other-language items in later medieval texts

This paper addresses the use in medieval texts of ‘lone other-language items’ (Poplack and Dion 2012), considering their status as loans or code-switches (Durkin 2014; Schendl and Wright 2011). French-origin and English-origin lexemes in Middle English, respectively, were taken from the Bilingual Thesaurus of Everyday Life in Medieval England, a source of loan words chosen for its sociolinguistic representativeness and studied via Middle English Dictionary citations and textbase occurrences. Four criteria were applied for whether they should be treated as code-switches or as loans: the textual context in which the item appears, the adoption of target language verbal morphology, the length of attestation within the target language of individual lexical items (Matras 2009), and the integration of items into the syntactic structure of nominal phrases in conflict sites for code-switching (Poplack et al. 2015). Results provide little support for code-switching as the channel for the integration of lone other-language items, suggesting rather that individual items of foreign origin were immediately borrowed, consistently with Poplack and Dion’s (2012) treatment of contemporary contact phenomena