Maleated Ethylene-Propylene Random Copolymers:  Determination of the Microstructure and Association Level by Fluorescence Spectroscopy

2001 ◽  
Vol 105 (21) ◽  
pp. 4827-4839 ◽  
Author(s):  
Veena Vangani ◽  
Jillian Drage ◽  
Junaid Mehta ◽  
Anna K. Mathew ◽  
Jean Duhamel
Keyword(s):  
Fluorescence Spectroscopy ◽  
Random Copolymers ◽  
Ethylene Propylene

A Critical Evaluation of Infrared Methods for Determination of the E/P Ratio of Ethylene Propylene Rubbers

1966 ◽  
Vol 39 (2) ◽  
pp. 226-240 ◽  
Author(s):  
P. J. Corish ◽  
M. E. Tunnicliffe
Keyword(s):  
Block Copolymers ◽  
Critical Evaluation ◽  
Random Copolymers ◽  
Chemical Methods ◽  
Ethylene Propylene ◽  
Ethylene Content ◽  
Infrared Methods ◽  
General Method ◽  
Crystalline Polyethylene

Abstract A general method of analyzing ethylene—propylene (EP) copolymers for comonomer content is needed which is applicable to all types of copolymers: random copolymers (I), … EPEEPEPPEPEEE …; alternating copolymers (III), … EPEPEPEP …, block copolymers (II), … PEE … EEPP … PPEE … EEP …; and copolymers containing random (or alternating) segments together with blocks along the chain, i.e., mixed I or III, and II. Random copolymers can contain odd-numbered sequences of CH2 groups if the EP units are head-to-tail; if some head-to-head, tail-to-tail addition occurs, then even-numbered sequences of CH2 groups will also be present (IV; structures I—IV are shown on the next page). Block copolymers sometimes have crystalline polyethylene blocks and may also contain crystalline, isotactic polypropylene blocks. Mixed copolymers are more complex in structure than either random or block copolymers considered individually. In view of the lack of chemical methods for assessment of copolymer type or even for the determination of the propylene content of a copolymer, the most fruitful approach so far has been in the application of infrared spectroscopy. As CH2 groups in the copolymers can appear in many different environments, the method of analysis should be primarily concerned with the assay of CH3 groups. Even if appreciable head-to-head, tail-to-tail addition occurs, these methyl groups are separated by two carbon atoms, and little interaction should occur. Consideration has also been given to the measurement of ethylene content or total thickness in order to complete the basis for the calculation of the E/P ratio.

scholarly journals Fluorescence spectroscopy for the determination of reconstitution time of an in-vial lyophilised product

2021 ◽  
Vol 597 ◽  
pp. 120368
Author(s):  
Khaled ElKassas ◽  
Krishnakumar Chullipalliyalil ◽  
Michael McAuliffe ◽  
Sonja Vucen ◽  
Abina Crean
Keyword(s):  
Fluorescence Spectroscopy

Synchronous fluorescence spectroscopy for determination of tahini adulteration

Talanta ◽  
2017 ◽  
Vol 167 ◽  
pp. 557-562 ◽  
Author(s):  
Havva Tumay Temiz ◽  
Ugur Tamer ◽  
Aysel Berkkan ◽  
Ismail Hakki Boyaci
Keyword(s):  
Fluorescence Spectroscopy ◽  
Synchronous Fluorescence ◽  
Synchronous Fluorescence Spectroscopy

Determination of the composition of ethylene-propylene copolymers by pyrolytic gas chromatography

1985 ◽  
Vol 27 (5) ◽  
pp. 1242-1247 ◽  
Author(s):  
A.V. Bratchikov ◽  
B.A. Berendeyev ◽  
A.G. Rodionov
Keyword(s):  
Gas Chromatography ◽  
Ethylene Propylene
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