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A series of copolyamic acid (PAA) were synthesized from various ratios of two diamines p-phenylene diamine and 4,4′-oxydianiline (ODA) via copolymerization with pyromellitic dianhydride (PMDA) in polar solvent dimethylacetamide. A mixture of acetic anhydride and triethylamine was used as the...
A study was made of how aspects of the mechanical response of polyurethane elastomers (PUs) based on poly(ethylene adipate) (PEA) vary with the number of CH2 methylene groups when using chain extenders of the type HO–(CH2)p–OH. The effect of varying the odd–even number of CH2 groups in...
The present investigations were undertaken to find out whether and how often cycling, processing and programming can be repeated, whether repeated programming affects the one way effect and how much irreversible strain the shape memory polymeric material accumulates at a particular temperature....
Shape memory polyurethanes (SMPUs) have been extensively investigated but shape memory polyurethane-ureas (SMPUUs) with aromatic diamines as chain extenders have been rarely reported. In the present study, a series of SMPUs and SMPUUs having crystalline reversible phase were prepared. The shape...
The present research was focused on investigating the ability of different siloxane-based polymeric coatings to provide environmental protection to monumental limestone (Repedea from Romania) used in the north-eastern part of Romania for the construction of many stone monuments. Three...
Thermoset polyimide matrix resins with high melt processability for high-temperature carbon fiber composites were prepared from the diethyl ester of 3,3′,4,4′-benzophenonetetracarboxylic acid (BTDE) and the aromatic diamine mixtures consisting of...
Distyryl- and nitrodistyrylanthracene-based polymers (P1 and P2, respectively) have been synthesized and characterized. The polymers are fully soluble in common organic solvents and have number-average molecular weights of 18 570 and 23 480 g mol−1 for P1 and P2, respectively. The optical...
Through the use of thermogravimetry (TG), this work explores the thermal degradation mechanism and kinetics of Kapton (polyimide) film. Isoconversional kinetic methods, which provide activation energy as a function of degradation, present insight into the development of a five-step competitive...
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