Stereocomplex formation between enantiomeric poly(α‐methyl‐α‐ethyl‐β‐propiolactones): Effect of molecular weight

Abstract

The stereocomplex behavior of poly(a-methyla-n-propyl-b-propiolactone) (PMPPL) is very similar to that of PMEPL. 11 In contrast, when PMEPL and PMPPL of opposite configurations are mixed together, there is no evidence of stereo-

Stereocomplexation of Stereoregular Aliphatic Polyesters: Change from Amorphous to Semicrystalline Polymers with Single Stereocenter Inversion

“…22 °C in the T m on the first heat relative to the enantiopure polymers and crystallization upon cooling at approximately 173 °C, along with a melting event on the second heating cycle (Table , entry 8; Figure S32). The immediate crystallization from the melt was previously noted for other PO-based polyesters, indicating higher crystallinity and more stable interlocked stacking . Notably, the semicrystalline complex is insoluble in THF for GPC analysis, in contrast to the individual polymers which readily dissolve.…”

“…The immediate crystallization from the melt was previously noted for other PO-based polyesters, indicating higher crystallinity and more stable interlocked stacking. 45 Notably, the semi- crystalline complex is insoluble in THF for GPC analysis, in contrast to the individual polymers which readily dissolve. Upon subjecting the copolymers to multiple DSC cycles, we noticed a decrease in their T g and T m values.…”

“…PLA-related polymers have been studied extensively for stereocomplexation, − and other examples include polymethylmethacrylates, − polycarbonates, ,− polyhydroxyalkanoates, − polysaccharides, and polycarbodiimides . Notwithstanding these advances, the number of polyester stereocomplexes is modest and much remains to be learned about the factors contributing to stereocomplexation. − …”

Mass Spectrometry of Synthetic Polymers

“…The same MS method was used to investigate the effect of long time aging on the chain end of poly( p -methoxystyrene) . Furthermore, the characterization of poly(ether imide)s , , poly(amidoamines), poly(ester amide)s , poly(epichlohydrin) , telechelic poly( N -isopropylacrylamides) , cyclic poly(lactides) , enantiomeric poly(α-methyl-α-ethyl-β-propiolactones) , and multicyclic poly(ether sulfone)s by MALDI-TOF MS was reported. Liu and Mishra described the atom-transfer radical polymerization of menthyl acrylate .…”

Peptide and Protein Stereocomplexes

“…It aims to offer a comprehensive understanding of stereocomplexation in peptides and proteins, identifying the gaps, discussing its implications, and highlighting the role of stereocomplexation in various applications, aiming to inspire further research and advancements in this direction. Stereocomplexation in other polymers is outside the scope of this report, since it already has been extensively covered elsewhere. ,− It is briefly covered here. Interested readers are referred to the cited literature on the same topic.…”