Diglycidyl ether of bisphenol A -based

DGEBA diglycidyl ether of bisphenol A-based epoxy resin of epoxy content 0.52 eq./lOO g... 

A study of compatible simultaneous interpenetrating polymer networks (SINs) of diallyl phthalate and (diglycidyl ether of bisphenol A)-based epoxy resin [134],... 

The functionalization of CNTs through plasma treatment represents a novel and easy approach to scale up towards industrial applications. In more recent works, there were many attempts to fluorinate CNT sidewalls in such manner. The CF4 plasma treatment of SWNT sidewalls was demonstrated to enhance the reactivity of tubes with aliphatic amines.The cure reaction of diglycidyl ether of bisphenol A-based epoxy resin (DGEBA), when reacted with butylamine molecules (BAMs) anchored on to the plasma treated fluorinated SWNTs, was reported. The advantage of this method was that the functionalization could be achieved through a simple approach, which is widely used in thin film technologies. As covalently modified CNTs with fluorine groups offer the opportunity for chemical interactions with the amine systems, it was recently demonstrated that this... 

Unsaturated poly(ester amide) resins were also prepared by reaction between diglycidyl ether of bisphenol-A-based epoxy and unsaturated aliphatic bisamic acids, using a base catalyst (Fig. 5.4). These resins were then blended with styrene to produce homogeneous resin syrups which were cured by using BPO as the free radical initiator. 

Diglycidyl ether of bisphenol A based epoxy resins... 

DGEBA diglycidyl ethers of bisphenol A-based resin... 

In addition, blending with epoxy/amine blends has been reported as a suitable route to improve the mechanical properties of phenolic resins and to reduce the cure temperature [a.368]. The results reported demonstrate that the epoxy/amine content should be kept below 15 wt% to avoid a significant reduction of the thermal stability of the blend. Flame resistance experiments identified the aromatic diglycidyl ether of bisphenol-A-based (epoxy equivalent of 190 g/mol) epoxy/amine system as one of the best epoxy resins to produce thermally stable blends with the phenolic resol. 

Diglycidyl Ether of Bisphenol A. The Hquid DGEBPA-based resins exhibit low acute toxicity with a single-dose oral LD q value in rats of >2000 mg/kg (40). The potential for absorption of DGEBPA through the skin in acutely toxic amounts is low. LD q values of >800 mg/kg for acute dermal toxicity have been obtained from studies using both the pure and commercial DGEBPA (41,42). 

The complex sorption behavior of the water in amine-epoxy thermosets is discussed and related to depression of the mechanical properties. The hypothesized sorption modes and the corresponding mechanisms of plasticization are discussed on the basis of experimental vapor and liquid sorption tests, differential scanning calorimetry (DSC), thermomechanical analysis (TMA) and dynamic mechanical analysis. In particular, two different types of epoxy materials have been chosen low-performance systems of diglycidyl ether of bisphenol-A (DGEBA) cured with linear amines, and high-performance formulations based on aromatic amine-cured tetraglycidyldiamino diphenylmethane (TGDDM) which are commonly used as matrices for carbon fiber composites. 

Diglycidyl Ether of Bisphenol A. The liquid DGEBPA-based resins exhibit low acute toxicity with a single-dose oral LD50 value in rats of... 

The increase of the glass transition temperature with the conversion of the thermosetting polymer may be followed by DSC. Figure 4.6 (Montserrat, 1992), shows DSC thermograms in the heating mode, for a system based on diglycidyl ether of bisphenol A (DGEBA)-phthalic anhydride and a commercial tertiary amine as initiator, cured at 80°C (a) and 130°C (b), for different times, tc (h). The initial formulation exhibits a shift in the baseline at Tg0= —23.2°C (defined at the midpoint of the shift). Tg increases with cure time at constant temperature. The completely cured... 

A survey of the extensive literature of kinetic results reported for epoxy-anhydride-tertiary amine systems is surprising. Both nth order and autocatalytic expressions have been reported for the same system. As an example, we analyze the results reported for the copolymerization of a diepoxide based on diglycidyl ether of bisphenol A (DGEBA) with methyl-tetrahydrophthalic anhydride (MTHPA), initiated by benzyldimethylamine (BDMA). 

The/flc-ClRe(CO)3(4,7-Ph2-phen) complex has been demonstrated to be a useful spectroscopic probe in the curing of photosensitive epoxy-based materials [100], Emission spectra obtained from a 0.05-mm thickness film of a mixed epoxy system of bisphenol-A/novalac resin (Interz, SU8) and diglycidyl ether of bisphenol-A (DGEBA) containing cation-generating triarylsulfonium hexafluo-roantimonate salts as photoinitiators (Union Carbide, Cryacure UVI-6974) and... 

Epon 828 resins, which are based on diglycidyl ether of bisphenol A filled with 40wt.% Si02, were irradiated at 4.9 K and tested at 77 K after being warmed up to room temperature. The flexural and compressive strengths of the filled epoxy resins were found to be little affected by a y-ray dose of 2 x 107 Gy, but to deteriorate significantly after exposure to 1 x 108 Gy [49],... 

Many types of epoxy resins can be used in adhesive formulations. These are characterized in Table 4.1. The most commonly used type is the resin-based diglycidyl ether of bisphenol A (DGEB A). Epoxy novolac, flexible epoxy, high-functionality, and fihu-forming epoxy resins are also used in specialty applications. 

Epoxy resins based on diglycidyl ether of bisphenol A are not only the oldest type of epoxy resins but also the most valuable in adhesive formulations. The primary reasons for their popularity have been... 

The lower-viscosity grades have an EEW of about 175 and are virtually pure diglycidyl ethers of bisphenol A. They are so pure, however, that they will crystallize on storage. The crystals melt on warming above 40°C, and heating can be used to restore a crystallized resin to its previous form. Special crystallization-free resins systems have been formed by blending low-viscosity DGEBA resins with more conventional bisphenol A-based epoxy resins. 

Michailov YM, Ganina LV, Smirnov VS. (2002) Phase equilibrium in biphase polymer systems based on Diglycidyl Ether of Bisphenol A. In Rozenberg BA, Sigalov GM (eds.). Heterophase Network Polymers Synthesis, Characterization, and Properties, pp. 33-42, CRC Press. 

Lichtenhan et al. [23,24] prepared several monosubstituted POSS epoxides (XIX). The Cs-based chain epoxy (5-9 wt%) was used with 1,4-butanediol diglycidyl ether (EDGE) (XX), diglycidyl ether of Bisphenol A (DGEBA) (XXIII) and polyoxypropylene diamines (XXI) to prepare nano-reinforced epoxy network glasses (Scheme 6) [23]. 

In this paper we discuss the use of carbon-13 nmr to measure epoxide equivalent weights of epoxy resins based on the diglycidyl ether of bisphenol A (DGEBA). The results obtained to date indicate that the carbon-13 technique could be an attractive alternative to current methods. 

Table I lists typical properties of a baker s dozen of these resins, produced by typical direct preparations, without extensive purification. Overall, the viscosities of these resins were quite low, particularly by comparison to the well known general purpose epoxy resins based on the diglycidyl ether of bisphenol A (DGEBA). The more shielded higher alkylsubstituted hydantoin rings favored lower viscosities. Some anomalies in these viscosities presumably reflected either a tendency of certain resins to crystallize, or the presence of some species of higher molecular weight, formed by reaction of the glycidyl group with a second hydantoin ring.

A cured epoxy synthesised from a mixture of the diglycidyl ether of bisphenol A (DGEBA) and 1,3-phenylenediamine was studied by NMR spectroscopy including multiple pulse techniques and spin-lattice relaxation in the rotating frame. Tip. The study [28] focused on the water distribution based upon possible variation in the cross-link density measured by spin diffusion. From the analysis involving a combination of Tip and multiple... 

The material used was a diglycidyl ether of bisphenol A (DGEBA) based epoxy resin (Ciba-Geigy, GY250) cured using stoichiometric amounts of 4,4 -diamin-odiphenyl sulfone (DDS). The rubber used for the modifications was Hycar car-boxy-teminated butadiene-acrylonitrile (CTBN) rubber (1300 x 13). The curing schedule for all the rubber-modified epoxy-DDS systems was as follows first the rubber and then DDS were mixed with the epoxy resin and stirred at 135 °C until the DDS was dissolved the systems were cured for 24 h at 120 °C and then postured for 4 h at 180 °C. The control epoxies were cured according to the same schedule. 

Many epoxy resins are based on the diglycidyl ether of bisphenol A, made by the reaction of epichlorohydrin (very toxic) with the diol in the presence of base (12.15). 

Structural epoxy adhesives based on DGEBA (diglycidyl ether of bisphenol A) were cured with poly(amido-amine) and HB products at room temperature for seven days. 

One of the methods for the synthesis of high molecular weight polyhydroxy ethers based on Bisphenol A is the base catalyzed polyaddition of the diglycidyl ether of Bisphenol A (BADGE) with Bisphenol A (BPA) in the melt or in solution (Scheme 1). 

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