Bisphenol-A-polycarbonate-bisphenol-A-polysulfone block copolymers

1977 ◽  
Vol 17 (8) ◽  
pp. 647-651 ◽  
Author(s):  
James E. McGrath ◽  
Thomas C. Ward ◽  
Ehud Shchori ◽  
Andrew J. Wnuk
Keyword(s):  
Block Copolymers ◽  
Bisphenol A ◽  
Bisphenol A Polycarbonate

Structure-Property Studies on a Series of Polycarbonate-Polydimethylsiloxane Block Copolymers

1980 ◽  
Vol 53 (5) ◽  
pp. 1160-1169 ◽  
Author(s):  
S. H. Tang ◽  
E. A. Meinecke ◽  
J. S. Riffle ◽  
J. E. McGrath
Keyword(s):  
Block Copolymers ◽  
Bisphenol A ◽  
Elevated Temperatures ◽  
In Situ Polymerization ◽  
Soft Segment ◽  
Thermoplastic Elastomers ◽  
Structure Property ◽  
Polydimethyl Siloxane ◽  
Bisphenol A Polycarbonate ◽  
Siloxane Oligomers

Abstract Block copolymers composed of hard and soft segments form an interesting class of materials ranging from thermoplastics to thermoplastic elastomers depending on their composition and/or the size of segments. These materials have attracted much attention in the past decade because by careful tailoring, polymers of desired properties can be obtained. Yet they are thermoplastic in nature and can be processed and even reprocessed thermally. Among the common elastomers that can be used as the soft segment in a block copolymer, polydimethyl-siloxane is of special interest due to its great thermal stability at elevated temperatures and high flexibility at low temperatures. Block copolymers containing polydimethylsiloxane as the soft segment and various thermoplastics such as poly(α-methylstyrene), polystyrene, and polysulfone, etc., as the hard segment, have been synthesized and studied. A group of randomly alternating block copolymers of bisphenol-A polycarbonate and polydimethylsiloxane have also been prepared by in situ polymerization of dichloro-terminated siloxane oligomers and bisphenol-A and phosgene. The properties of these block copolymers as well as those of the others have been discussed to some extent in a general review. This work reports the results of a study on the structure-property relationship of a series of perfectly alternating block copolymers of bisphenol-A polycarbonate and polydimethylsiloxane synthesized via different routes. They were prepared by silylamine-hydroxyl reaction. Slightly less than the stoichiometric quantity of siloxane oligomers was incrementally added to a hydrated solution of the polycarbonate in refluxing chlorobenzene. The reaction can be represented by the simple scheme:

Quantitative Fourier Self-Deconvolution and Fourier Transform Infrared Analysis of Bisphenol-A-Polycarbonate/Poly(Dimethylsiloxane) Random Block Copolymers

1989 ◽  
Vol 43 (7) ◽  
pp. 1172-1179 ◽  
Author(s):  
Eric R. Mittlefehldt ◽  
Joseph A. Gardella
Keyword(s):  
Fourier Transform ◽  
Block Copolymers ◽  
Bisphenol A ◽  
Bulk Composition ◽  
Fourier Transform Infrared ◽  
Infrared Analysis ◽  
Bisphenol A Polycarbonate ◽  
Beer's Law ◽  
Random Block ◽  
Beer’S Law

Fourier self-deconvolution (FSD) is used to enhance the spectral resolution of Fourier transform infrared results obtained from thick solution-cast films of bisphenol-A-polycarbonate-poly(dimethylsiloxane) blends and random block copolymers. Despite the severity of band overlap in the region from 1300 to 1200 cm−1, accurate determinations of bulk composition are made from the deconvolved absorbance (transmission mode) spectra of eleven blends and three random block copolymers. With compositions expressed in terms of each component's relative concentration, these results are used to develop a multicomponent Beer's law relationship that is verified through the determination of appropriate homopolymer absorptivities. Fourier transform infrared attenuated total reflectance results are compared to the multicomponent Beer's law relationship in an effort to quantitate the surface excess of siloxane 0.004–1.6 µm from the air/solid interface.

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