How can we intelligently use good science and debunk misinformation offered as “science”? The keys are going back to basics and communication. At a recent conference one of my associates queried, “How many of the people present actually know the difference between an ether and an ester? “...
A segmented poly(ether/ester) multiblock copolymer containing acetylene groups within the hard segment was_synthesized starting from polyethylene glycol) with a number-average molecular weight M_n = 1000, 2-butyne-1,4-diol and terephthaloyl dichloride. Thermal and spectroscopic data suggest a blocky...
(11)#Freely Rotating Bonds: 18; (12)Polar Surface Area: 64.61 Å2; (13)Index of Refraction: 1.445; (14)Molar Refractivity: 74.28 cm3; (15)Molar Volume: 278.8 cm3; (16)Polarizability: 29.44×10-24cm3; (17)Surface Tension: 36.2 dyne/cm; (18)Enthalpy of Vaporization: 72.09 kJ/mol; ...
A) aromatic B) aldehyde C) anhydride D) ester E) alkyne F) alkene G) amine H) carboxylic acid I) ether J) amide K) ketone L) alcohol What type of organic compound contains only carbon-to-carbon single bonds? They are the most chemically inert of all...
The membrane-spanning bonds may form after the ester–ether reduction steps, if the linking process is terminally biosynthetic. However, the balance of evidence to date makes it more likely that ester-to-ether reduction is the terminal step, especially if the common presence of easily hydrolyzable...
Generally, this migration takes place by the hydrolysis of the ester bond of the polycarbonate or epoxy resins, a process that can be sped up by heating such as during sterilization or cooking and acidic or basic conditions. In addition, the synthesis of epoxy phenolic resins is base...
Although there are several known methods in the literature to make polyols from vegetable oils, a typical method comprises two steps: (i) partial or complete epoxidation of oils with peroxyacid that converts a portion or all of the double bonds of the oil to epoxide groups, (ii) ring ...
ester soft segments that undergo hydrolysis (Figure II.4.2.3). By comparison, corresponding poly(ether urethanes) are very resistant to hydrolysis, although more susceptible tooxidation(see the section, below, on oxidative biodegradation). Whether such hydrolytically degraded poly(ester urethanes) ...
Polyamides are most often prepared by direct amidation in which the amine group of a diamine or an amino acid bonds to the carboxyl of a diacid with the accompanying elimination of water. Derivatives of the acid function, such as an ester, acyl halide or amide, may be used as an alternati...
Aromatic primary monoamines may have additional functionality bound to the aromatic ring: such as, but not limited to, aryl groups, alkyl groups, aryl-alkyl groups, sulfone groups, ester groups, amide groups, halogens, halogenated alkyl or aryl groups, alkyl ether groups, aryl ether groups, ...