In:
Macromolecular Chemistry and Physics, Wiley, Vol. 222, No. 15 ( 2021-08)
Abstract:
Four new N ‐isopropylacrylamide‐ and N ‐ n ‐alkyl amine‐based acrylamide monomers, N ‐(3‐(alkylamino)‐ N ‐(3‐(isopropylamino)‐3‐oxopropyl) acrylamide (Mn) ( n = 4, 8, 10, 12) are successfully synthesized and polymerized via reversible addition‐fragmentation chain‐transfer polymerization (polyMn, n = 4, 8, 10, and 12), which are characterized by gel permeation chromatography, 1 H NMR, Fourier transform infra red spectroscopy, thermo‐gravimetry‐differential thermal analysis, differential scanning calorimetry (DSC), and rheology. All polymers are thermally stable and undergo a two‐step degradation process at ≈280 and ≈375 °C. Glass transition temperature ( T g )s of these polymers decrease gradually from 99.6 to 52.5 °C with increasing n ‐alkyl side chain length. The rheology of these polymers in melt state agrees to a typical Rouse‐melt behavior and allows for confirming the T g determined from DSC. Benzyl alcohol solution rheology proves a weak structural build‐up, in particular for polyM12. Comparison of the quantum chemical calculations of polyMns with n = 4–8 reveals increase in backbone helicity with increasing n ‐alkyl side chain length.
Type of Medium:
Online Resource
ISSN:
1022-1352
,
1521-3935
DOI:
10.1002/macp.v222.15
DOI:
10.1002/macp.202100118
Language:
English
Publisher:
Wiley
Publication Date:
2021
detail.hit.zdb_id:
1475026-0
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