Cross-Linking of Polypropylene via the Diels-Alder Reaction

Henky Muljana, Stefan Arends, Klaas Remerie, Gert Boven, Francesco Picchioni, Ranjita K Bose

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2 Citations (Scopus)
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Abstract

In this work, the possibility of preparing cross-linked polypropylene (PP) via Diels-Alder (DA) chemistry is explored. The overall strategy involves reaction of maleated polypropylene (the starting material), furfuryl amine (FFA), and bismaleimide (BM) as the cross-linking agent. The occurrence of reversible cross-linking was studied by checking the presence of relevant peaks in FTIR spectra, i.e., CH out-of-plane bending vibrations of the furan ring's peak (γCH) at an absorption band of 730-734 cm-1, CH=CH of the BM aromatic ring's stretching vibrations (υCH=CH) at an absorption band of 1510 cm-1, and the DA adduct (C-O-C, δDAring) at an absorption band of 1186 cm-1. In agreement with the spectroscopic characterization, the presence of a cross-linked network is also confirmed by rheology, namely the higher storage modulus (G') compared with loss modulus (G″) value (G' >> G″), as obtained via temperature sweep. Both the maleic anhydride (MA) content as well as the annealing temperature (50 °C and 120 °C) favor the DA reaction, while only partial de-cross-linking (retro DA) is observed at the higher temperature range of 150-200 °C. In addition, the products show higher mechanical robustness and thermal stability compared to the starting material.

Original languageEnglish
Article number1176
Number of pages16
JournalPolymers
Volume14
Issue number6
DOIs
Publication statusPublished - 2022

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