Studies on Polyesters
نویسندگان
چکیده
منابع مشابه
Model Studies Towards Alternative Cross-Linking of Unsaturated Polyesters
Fumaric and maleic acid esters are functionalised with propargylamine. A subsequent Pd/Cu-catalysed oxidative homo-coupling of two alkyne moieties yields the corresponding dimers. Hence, a model of an unsaturated polyester chain is cross-linked in a welldefined, metal-mediated reaction in a very high yield.
متن کاملNMR studies of molecular structure in fruit cuticle polyesters.
The cuticle of higher plants functions primarily as a protective barrier for the leaves and fruits, controlling microbial attack as well as the diffusion of water and chemicals from the outside environment. Its major chemical constituents are waxes (for waterproofing) and cutin (a structural support polymer). However, the insolubility of cutin has hampered investigations of its covalent structu...
متن کاملStudies on thermal degradation of aromatic polyesters by pyrolysis-gas chromatography.
Thermal degradation of aromatic polyesters (see text for formula) (m = 2, 3, 4, 5, and 6) was studied by pyrolysis/gas chromatography using a Curie-point pyrolyzer directly attached to a gas chromatograph with a thermally stable polar separation column (Thermon-1000) to cover a wide range of the degradation products. The characteristic peaks appearing on the pyrograms were identified using a ma...
متن کاملFuture of microbial polyesters
Numerous microorganisms accumulate polyesters classified as polyhydroxyalkanoates (PHAs) as carbon and energy storage material when the growth condition is unfavorable in the presence of excess carbon source. Natural PHAs typically consist of various (R)-hydroxycarboxylic acids, and exhibit different material properties depending on the monomer composition. Such diversity comes from different m...
متن کاملBiomedical Applications of Biodegradable Polyesters
The focus in the field of biomedical engineering has shifted in recent years to biodegradable polymers and, in particular, polyesters. Dozens of polyester-based medical devices are commercially available, and every year more are introduced to the market. The mechanical performance and wide range of biodegradation properties of this class of polymers allow for high degrees of selectivity for tar...
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ژورنال
عنوان ژورنال: Kobunshi Kagaku
سال: 1965
ISSN: 1884-8079,0023-2556
DOI: 10.1295/koron1944.22.734