Handbook of Maleic Anhydride Based Materials 2016
DOI: 10.1007/978-3-319-29454-4_4
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The Quintessential Alternating Copolymer Family: Alkyl Vinyl Ether co-Maleic Anhydride Copolymers

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Cited by 5 publications
(6 citation statements)
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“…Such an alternating process has long been thought to involve charge transfer complexes (CTCs), which occur between pairs of electron donor and acceptor monomers. In such systems, contrasts in nucleophilicity/electrophilicity cause them to noncovalently associate as a single unit, thus introducing controlling phenomena for the assembly of the polymer chain. Homopolymerization of the CTC unit is a commonly held view of the mechanism for subsequent alternating copolymerization, , involving multiple specific models. , The degree of complex participation in the reaction mechanism is proportional to the concentrations of the monomersthe predominant polymerizing species is the complex for high monomer feed concentrations, but this changes to be the individual monomers in lower monomer concentration conditions.…”
Section: Discussionmentioning
confidence: 99%
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“…Such an alternating process has long been thought to involve charge transfer complexes (CTCs), which occur between pairs of electron donor and acceptor monomers. In such systems, contrasts in nucleophilicity/electrophilicity cause them to noncovalently associate as a single unit, thus introducing controlling phenomena for the assembly of the polymer chain. Homopolymerization of the CTC unit is a commonly held view of the mechanism for subsequent alternating copolymerization, , involving multiple specific models. , The degree of complex participation in the reaction mechanism is proportional to the concentrations of the monomersthe predominant polymerizing species is the complex for high monomer feed concentrations, but this changes to be the individual monomers in lower monomer concentration conditions.…”
Section: Discussionmentioning
confidence: 99%
“…Such an alternating process has long been thought to involve charge transfer complexes (CTCs), which occur between pairs of electron donor and acceptor monomers. In such systems, contrasts in nucleophilicity/electrophilicity cause them to noncovalently associate as a single unit, 33 thus introducing controlling phenomena for the assembly of the polymer chain. Homopolymerization of the CTC unit is a commonly held view of the mechanism for subsequent alternating copolymerization, 34,35 involving multiple specific models.…”
Section: Acs Biomaterials Science and Engineeringmentioning
confidence: 99%
“…The hydrodynamic diameter of VEMAC-Tryp at pH 5.9 was ~4.0 nm, which was very similar to that of unmodified trypsin (Table 2), whereas the diameter increased significantly to ~21.6 and ~20.9 nm at pH 8.0 and 9.8, respectively ( Table 4). Considering that the pKa2 of the maleic acid moiety in VEMAC is 6.5 [32], many carboxyl groups in VEMAC are protonated at pH 6.0, resulting in a decrease in solubility and in shrinkage of VEMAC in aqueous media, which prevent the access of the BAPNA substrate The pH dependence of VEMAC-Tryp enzymatic activity was also investigated. Whereas unmodified trypsin exhibited maximum activity at pH 8.0 and significantly decreased activity at higher pH, VEMAC-Tryp activity increased from pH 5.9 to 9.8, and enzymatic activities at pH 9.0 and 9.8 were almost the same as the maximum activity of unmodified trypsin (~30 µM/min) (Figure 3b).…”
Section: Physicochemical Characterization Of Vemac-trypmentioning
confidence: 99%
“…The hydrodynamic diameter of VEMAC-Tryp at pH 5.9 was~4.0 nm, which was very similar to that of unmodified trypsin (Table 2), whereas the diameter increased significantly to~21.6 and~20.9 nm at pH 8.0 and 9.8, respectively ( Table 4). Considering that the pK a2 of the maleic acid moiety in VEMAC is 6.5 [32], many carboxyl groups in VEMAC are protonated at pH 6.0, resulting in a decrease in solubility and in shrinkage of VEMAC in aqueous media, which prevent the access of the BAPNA substrate molecule to the active site of trypsin. On the other hand, the larger hydrodynamic diameters observed above pH 8.0 suggest that the fully hydrated state of VEMAC chain on the trypsin surface with deprotonated carboxyl groups would not affect the accessibility of BAPNA to trypsin.…”
Section: Physicochemical Characterization Of Vemac-trypmentioning
confidence: 99%
“…Nonetheless, a key difference is their behavior regarding conventional free radical polymerization, a favorite methodology among industrial processes: acrylates readily homopolymerize while maleic anhydride does not. Interestingly, MA does copolymerize very well (and generally very fast) with other vinyl comonomers such as styrene or vinyl ethers to form alternating copolymers …”
Section: Introductionmentioning
confidence: 99%