Tetramethyl bisphenol A polycarbonate

Rotational-echo double resonance NMR Tetramethyl bisphenol A polycarbonate Tetrachlorophthalic dimethyl ester Wiliams, Landel, Ferry... 

In order to investigate the molecular motions involved in this transition and, in particular, the nature of the associated cooperativity, it is interesting to consider not only BPA-PC, but also tetramethyl bisphenol A polycarbonate, TMBPA-PC, (Fig. 25) as well as copolymers of BPA and TMBPA carbonates, and compatible blends of BPA-PC and TMBPA-PC. 

Methyl methacrylate-co-N-methyl glutarimide copolymer Bisphenol A polycarbonate Tetramethyl bisphenol A polycarbonate Aryl-aliphatic copolyamides... 

In order to investigate the effect of a methyl substitution of the phenyl hydrogen in ortho position to the carbonate group, tetramethyl bisphenol A polycarbonate (TMBPA-PC), whose the chemical structure is shown in Fig. 66b, has also been considered. In the case of TMBPA-PC, the secondary fi transition happens at 50 °C, at 1 Hz (Fig. 67), in such a way that it allows one to examine the consequences of such a large shift of the fi transition on the mechanical properties. 

Investigation of the mechanical properties of bisphenol A polycarbonate (BPA-PC) and tetramethyl bisphenol A polycarbonate (TMBPA-PC) has led to... 

The observation that Bib is more exothermic than Bz3 is not surprising when one considers the fact that blends of tetramethyl bisphenol-A polycarbonate with polystyrene are miscible while blends of bisphenol-A polycarbonate with polystyrene are immiscible (43 ). Apparently, substitution of methyl groups on the aromatic rings in the backbones of these materials enhances miscibility with the styrene repeat unit. The observation that Biz is also exothermic is quite surprising, considering the similarity of the trimethyl and dimethyl ether units. Using regular solution approximations, one could... 

Abbreviations for the polymeric units in Table 2.10 (C H )- - phenyl ring, a-MS - alpha-methyl styrene, AN, acrylonitrile, BMA - butylmethacrylate, CHMA - cyclohexylmethacrylate. Cl - caprolactone, C(VC) - unit of chlorinated PVC, DNS - 2,4-dini-trostyrene-co-styrene, DTC -2,2-dimethyltrimethylenecarbonate, HFPC - hexafluoro bisphenol-A polycarbonate, MA - maleic anhydride, MMA - methylmethacrylate, PAr - unit of polyarylate, Phenoxy - unit of polyhydroxy ether of bisphenol-A, PPE - unit of poly(2,6-dimethyl-1,4-phenylene ether), S - styrene, TMPAr - unit of tetramethyl bisphenol-A polyarylate, TMPC - unit of tetramethyl bisphenol-A polycarbonate, VAc - vinyl acetate, VC - vinyl chloride, VCVAc90 - VC-co-VAc copolymer with 90 wt% VC, VME - vinylmethylether. 

As indicated in Fig. 23.1, a sample consists of a rigid glass indenter and an elastomer substrate of crosslinked poly(dimethyl siloxane) (PDMS), which are both coated with the polymer layers of interest. These layers include a semicrystalline layer of poly(ethylene oxide) (PEO) sandwiched between glassy polymer layers of poly(tetramethyl bisphenol A polycarbonate) (TMPC). These polymers will be described in more detail within this section along with the steps that were taken to select these polymers for the study of a glassy/semicrystalline interface. 

Kim, S. and Liu, J. 2001. Molecular modelling of bisphenol-A polycarbonate and tetramethyl bisphenol-A polycarbonate. Korea Polym. J. 9 129-142. 

Transmission electronic microscopy Tetramethyl bisphenol A polycarbonate... 

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