Branching, polycarbonate

Fig. 1. Melt viscosity as a function of shear rate for (—) linear BPA polycarbonate and (-) branched polycarbonate. To convert Pa-s to poise, multiply...

Branch and bound techniques, discrete optimization via, 26 1023 Branched aliphatic solvents, 23 104 Branched alkylbenzene (BAB), 77 725 Branched copolymers, 7 610t Branched epoxies, 70 364 Branched olefins, 77 724, 726 Branched polycarbonates, 79 805 Branched polymers, 20 391 Branched primary alcohols, synthetic processes for, 2 2 7t Branching... 

Branched polycarbonates consisting of 2,4-bis[l-(4-hydroxyphenyl)-l-methy-lethyl]phenol, (I), and phosgene were previously prepared by the authors (1) and used in engineered plastics. 

Horn et al. (2) prepared branched polycarbonate resins by reacting l,l,l-tris(4-hydroxyphenyl)ethane and 3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole, (II), with phosgene. 

Another option in improving the flowability of these blends is the use of a branched polycarbonate. Brandstetter et al. [69] found that a dianhydride branched polycarbonate combined with ASA can be injection moulded at temperatures 5-10 K lower than similar blends based on linear polycarbonates. 

Mark, V. Hedges, C.V. Branched Polycarbonate from Carboxy Containing Diphenol US Patent 4,562,242, December 31, 1985. 

Scott, S.W. Process for Preparing a Branched Polycarbonate US Patent 4,001,184, January 4, 1977. 

Figure 2.12 Strain hardening (SH) versus Hencky strain for branched polycarbonate of bis-phenol-A (PC, grade PK-2870) at 7=270 °C and s = 0.3-1 s .The slope of the dependence, SSH = 0.201, is a characteristic material parameter at the test temperature.

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