Bisphenol copolycarbonates

Methyl methacrylate n-Propyl methacrylate Vinylidene fluoride Acrylonitrile-co-methyl Carbonate of bisphenol Copolycarbonate of bisphenol-A hexafluorobisphenol-A Epichlorohydrin-co-ethylene glycol Ethylene, chlorinated... 

Copolycarbonates, (I), consisting of isosorbide, bisphenol A, and diphenyl carbonate were prepared by Dhara et al. (4) and used as optical waveguides. 

D isphenol-A carbonate oligomers have been used in the syntheses of random and block copolycarbonates (J, 2). The physical properties of these polymers can be altered by tailoring sequence distribution and block size in the copolymer. To tailor sequence distribution and block size, it is necessary to know the molecular weight and molecular-weight distribution of bisphenol-A prepolymers present during synthesis. 

Table 3.28 Comparision of bisphenol-TMC polycarbonate, bisphenol-TMC copolycarbonates and other amorphous thermoplastics [94]...

Mahabadi and Alexandru [74] have published data on thermotropic copolycarbonates of biphenol (BP) and diethylene glycol (DEG) with hydroquinone (HQ), methyl hydroquinone (MHQ), f-butyl HQ, oxydiphenol (ODP) or bis(4-hydroxyphenyl)methane (DPM) or bisphenol A. The tabulated compositions and calculated MI values are recorded with the published data on mesophase transitions in Table 4. Mesophases appear only to be present when the MI score >10.1. However, the gap in values between mesogenic materials and non-mes-ogenic materials in the three series reported is about +1 and therefore it cannot be claimed on this evidence alone that polycarbonates have a similar critical value to polyesters and polyamides. 

FAB-MS has been used to identify the low molar mass oligomers produced in the partial ammonolysis of an essentially alternating copolycarbonate containing resorcinol and bisphenol-A (BPA) units. ... 

Random Copolycarbonates Characterization and Comparative Properties of Polymers Containing Tetrachlorinated Bisphenols... 

Except in the case of the copolycarbonate of bisphenol A with the DHS salt of TCBF-MA, all polyceurbo-nates emd copolycarbonates were prepared via a recently published method meJcing use of pyridine as catalyst and tetrahydrofuran as solvent (2 ). Due to insolubility of the dimethyl sulfate salt of TCBF-MA in THF, an older, but less convenient approach, making use of pyridine as both solvent emd catalyst had to be employed (17,18). 

As a further control, copolymers of bisphenol A and TCBA were also polymerized to the proper molecular weight and the fact and extent of copolymerization was determined by NMR. All homopolycarbonates and copolycarbonates with the exception of the TCBA homopolymer were of comparable moleculeu weight (Mt 30 to 45,000). 

Solvent resistance was measured in 22 solvent systems, in 18 of these, the bisphenol A polymer and TCBF copolycarbonates behaved similarly. In 3 of them, viz., carbon tetrachloride, acetic acid, and acetonitrile, the TCBF copolyc urbonates were definitely better. In only one case, namely that of ethyl acetate, was bisphenol A polycarbonate superior. 

Acrylonitrile-ct -styrene Copolycarbonate of bisphenol-A and tetramediylbisphenol-A Some blends showed LCST, depending on compositions of I and II Kim and Paul (1992e)... 

Similar functionalization was described in the synthesis of poly(bisphenol-A carbonate)-gro/i-polystyrene 115 by a macromonomer technique. Pyridine rather than triethylamine was the proton acceptor of choice in the synthesis of the graft copolycarbonate by solution polycondensation [63]. 

The first blends studied on polyesters based on 1,4-CHDM were made of the amorphous copolyester of terepthalic and isophthalic acids and 1,4-CHDM (PCTA) and polycarbonate of bisphenol A (126). The single displayed for the whole range of compositions was taken as demonstrative of full miscibility, which is explained as due to the positive physical interactions between the polyester and the polycarbonate. PCTA is also miscible with a copolycarbonate of bisphenol A and l,l-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclo hexanone (TMC) for all compositions except for those involving a polycarbonate entirely made of TMC (127). 

Liaw and Chang [a.345] reported on brominated fluorine-containing homopolycarbonates and copolycarbonates of varied unit ratio that were synthesised from 3,3, 5,5 -tetrabromobisphenol-AF and bisphenol-A polycondensed with trichloromethyl chloroformate using a phase-transfer catalyst at 25 °C. The homopolycarbonate based on tetrabromobisphenol-AF had the highest Tg at 205 °C. The TG cnrves show that the Tj of polycarbonates was in the range of 445-475 °C. The LOI of homopolycarbonates based on bisphenol-A and tetrabromobisphenol-AF were found to be 26 and 93, respectively. 

Other bisphenols are often used in place of bisphenol A. Isophorone bisphenol is common and its structure is shown in Fig. 6.4. Copolymer PCs are also common where blends of different bisphenols are used. These are often block copolymers. The T of the copolycarbonates can be adjusted by changing bisphenol monomers and their ratios. 

The new advanced copolycarbonate resins are a copolymer of bisphenol A and bishydroxyphenol fluorene (BHPF), a fluorenyl derivate. Among the primary features of Inspire resins are equivalent or better heat and inherent ignition resistance without the use of halogens, improved processability, and superior transparency and optical properties when compared to advanced polymers. 

Block copolymers comprising carbonate and arylene ether blocks have been prepared by the catalytic decarboxylation of random or alternating copolycarbonates. This novel route to block copolymers is catalyzed by a number of catalysts and requires only that one of the bisphenols in the starting copolycarbonates be activated by electron-withdrawing substituents, e.g. 4,4 -dihydroxydiphenyl sulfone (bisphenol S), or 4,4 -dihydroxybenzophenone (bisphcnol K). 

The random copolycarbonates were prepared by the standard phosgenation procedure in dichloromethane with pyridine as the acid acceptor. Because of the slight difference in reactivity, these polymers may have a very small degree of blockiness which should not affect the results of this work. The alternating copolycarbonates were prepared in a similar fashion except that bisphenol A was first converted to the bis-chloroformate before the addition of bisphenol S or bisphenol K. All polymers were capped with tert-butylphenol. This work was conducted on 1 1 copolycarbonates of bisphenol A with either bisphenol S or bisphenol K. The chemistry of this novel procedure is illustrated in Scheme 1. 

The polymers included in this study are bisphenol-A polycarbonate (Bis-A PC), polyesteicarbonates (PEC), whose structures are defined in Figure 1, phenolphthalein bisphenol-A copolycarbonate, and polysulfone. All samples were compression molded and physically aged as described elsewhere, with the exception of those for the Fourier transform infrared (FTIR) measurements and solid state variable temperature nuclear magnetic resonance (VTNMR)... 

Copolycarbonate of bisphenol-A and tetramethylbisphenol-A Cyclohexyl methacrylate Cyclohexyl methacrylate-co-methyl methacrylate... 

Keul, H., Deisel, F., Hoecker, H., Leitz, E., Schoen, N. and Sylvester, G. (1992) Preparation of block copolycarbonates from o-bisphenol-based cyclic monomers and p-bisphenol-based cyclic oligomers. Ger OfFen, DE 4109278 Al. 

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