Synthesis and reactivity of a fluorinated N-alkylmaleimide towards free-radical grafting and polymerization reactions
| Autor: | Francesco Ciardelli, Valter Castelvetro, Federica Spagnoli, Mauro Aglietto |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Olefin fiber
fluorinated maleimide free-radical grafting polyolefin modification maleated polyolefin alternating copolymer perfluorocarboxylic acid Comonomer Organic Chemistry Maleic anhydride Biochemistry Oligomer Inorganic Chemistry chemistry.chemical_compound chemistry Polymerization Diamine Polymer chemistry Copolymer Environmental Chemistry Physical and Theoretical Chemistry Maleimide |
| Zdroj: | Journal of Fluorine Chemistry. 125:315-328 |
| ISSN: | 0022-1139 |
| DOI: | 10.1016/j.jfluchem.2003.07.014 |
| Popis: | A new fluorinated N -alkylmaleimide, N -(2-pentadecafluoro- n -octanoyloxy)-ethyl)maleimide (FOMI), was synthesized from perfluorooctyl carboxylic acid (FOCA) by reaction of the furan adduct of maleic anhydride (MAH) with ethanolamine and esterification of the resulting alcohol-imide. The reactivity of FOMI in free-radical reactions such as copolymerization with butyl vinyl ether (BVE) and grafting onto olefin copolymers (OCP) was investigated. Copolymerization with 2/1 molar excess BVE yields a copolymer with 63 mol% FOMI in moderate conversion, indicating that homopropagation of the maleimide prevails over comonomer alternation. The thermal stability of FOMI is quite poor, with onset of the pyrolytic loss of the N -perfluoroalkylcarboxyethyl moiety just above 100 °C, similarly to that of FOCA. This restricts the possibilities for direct melt functionalization of OCP with FOMI. To bypass this limitation three distinct approaches were preliminarly investigated. These were respectively based on either direct grafting of FOMI at low temperature, or reaction of a MAH-grafted polyolefin with a low molecular weight amine or amino-terminated oligomer bearing the perfluoroheptyl group. A functionalization degree FD=2% was achieved by solution grafting of a linear very low density polyethylene (VLDPE) with FOMI and Perkadox 16 as the free-radical initiator. The relatively high grafting efficiency was attributed to the growth of some oligomeric FOMI grafts onto the OCP. The alternative routes of post-modification of VLDPE- g -MAH by imidization with an amidoamine obtained by amidation of FOCA with a diamine or an amino-terminated FOMI/BVE oligomer, respectively, were also preliminarly investigated. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect