Epoxides equivalents

Cyclic Sulfites and Sulfates (epoxide equivalents) Syntfiesis 1992, 1035. 

Deflection temperature obtained with resin having an epoxide equivalent weight (EEW) of 190. 

Mol. ratio epichlorohydrin bis-phenol A Mol. ratio NaOHl epichlorohydrin Softening point rc) Molecular weight Epoxide equivalent Epoxy groups per molecule... 

The epoxide equivalent is a measure of the amount of epoxy groups. This is the weight of resin (in grammes) containing 1 gramme chemical equivalent epoxy. For a pure diglycidyl ether with two epoxy groups per molecule the epoxide... 

Resin Average Mol. Wr. Epoxide equivalent Viscosity cP at 25 C Melting point °C (Durrans)... 

The weight in grams to provide one reactive hydrogen atom for every epoxide group in lOOg of liquid epoxide resin of epoxide equivalent 190. 

Dioxathiolane oxides as epoxide equivalents and versatile synthons 98AHC(68)89. 

III Polyglycidyl compound of bisphenol A (abbreviated PGCBA) epoxide equivalent 0.137 kg/mol. 

Based on results of NMR and of gel permeation chromatography studies, a simplified composition for the PGCBA that yielded the epoxide equivalent of 0.137 kg/mol was assumed. The molar fraction of tetra functional molecules was taken as v4 = 0.45 and of trifunctional molecules was taken as v3 = 0.55. 

Epoxidation catalysts, organic titanium compounds as, 25 135 Epoxide determinations, 10 385 Epoxide equivalent mass (EEM), 10 355 Epoxide equivalent weight (EEW), 10 355, 361-363, 385... 

Significant advances in the chemistry of these ring systems over the past 10 years include the first unambiguous detection, and characterization by microwave spectroscopy as 1,2,3-trioxolane, of the primary ozonide from ethene and ozone (cf. Section 4.15.3.2), and the introduction of 1,3,2-dioxathiolane 2,2-dioxides as epoxide equivalents in organic synthesis (cf. Section 4.15.5.3). Advances have also been made in the synthesis and characterization of the chemistry of 1,2,3-trithiolanes and 1,2,3-trithioles. 

An homologous series of epoxy resins with constant epoxide equivalent weight and increasing branch concentration displayed increased melt viscosity and weight average molecular weight. 

Kamal et al. 85) examined the stoichiometric mixture of BADGE and MPD in the temperature range 57-147 °C. The data were fitted to Equation (4-11) with m = n = 1. In a later study on the same system Sourour and Kamal86) used amine to epoxide equivalent ratios (B) of 1.0 and 1.5 and found that the data fitted the Eq. 

Resin BADGE (X102, Epoxide equivalent mass = 830), approx 62 wt.-% Curing agent B, DICY/epoxy-amine adduct, 3.6wt.-%... 

If the resin chains are assumed to be linear with no side branching, and it is further assumed that an epoxy group terminates each end of the molecule, then the epoxide equivalent weight is one-half the average molecular weight of the epoxy resin. 

Mole ratio epichlorohydrin/ bisphenol A Mole ratio NaOH/ epichlorohydrin Softening point, °C Molecular weight Epoxide equivalent Epoxy groups/ molecule... 

Epoxide equivalent weight Viscosity (mPas at 25°C) Density (gm/ml/at 20°C) > Colour number (Gardener) Bisphenol type... 

The difference between the amount of acid added and the amount unconsumed, determined by titration with a standard base, is converted to the epoxide equivalent (Lee and Nivelle, 1972). Complete procedures of determining the EEW are given elsewhere (Lee and Nivelle, 1967). The EEW is the most important characteristic of bisphenol A epoxy resin. 

If a quantity per granune mole of epoxy resin is quoted the pbw of amine per 100 pbw resin is the quantity per gramme mole multiplied by 100 and divided by the epoxide equivalent weight of the resin. 

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