Combinations of dual-function azide-containing crosslinkers with C-H insertion capabilities for polymeric elastomers with improved adhesion properties

Jung, Dong Wook; Hong, Sung Chul

doi:10.1016/j.eurpolymj.2021.110906

Cited by 3 publications

(1 citation statement)

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“…Thus, controlled and noncatalytic covalent interconnection of PP chains through post-polymerization modification can be an efficient strategy to afford LCB-PP. In this context, the azide functionality has been of high interest to these authors due to its C–H insertion capability. − When the azide group is activated by heat or light, singlet or triplet nitrene intermediates are generated (Scheme b). Singlet nitrene can be inserted into C–H bonds to form new covalent bonds.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polypropylene with Strain Hardening Characteristics via the Noncatalytic C–H Insertion of Azidoformate

Kim

Song

et al. 2022

ACS Appl. Polym. Mater.

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Unlike linear polypropylene (PP), PP with long-chain branches (LCB-PP) has been known to have high value in polymer processing that requires high melt strength characteristics, such as thermoforming, foaming, and blow molding. In this study, LCB-PP is prepared utilizing the C–H insertion capability of an azidoformate (AF) group. A small molecule with two AF groups at both ends, tri(ethylene glycol) di(azidoformate) (GDAF), is synthesized, where the AF groups are thermally activated to afford nitrene intermediates to interconnect PP chains. Propylene/1-butene copolymer is employed as a dispersant of GDAF, which is first melt-blended with each other at 100 °C to afford a master batch. Then, the mixture is reactive melt mixed with PP at 165 °C to thermally activate the AF groups of GDAF to afford LCB-PP. The amount of branches is controllable by adjusting the GDAF loadings. Due to the branched chain architectures, investigation of rheological characteristics reveals more elastic and strain hardening melt behaviors of the resulting LCB-PPs with higher GDAF loadings, which demonstrates a simple and scalable melt mixing procedure to afford value-added polyolefins.

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