Poly(

N -vinylimidazole)- l -poly(propylene glycol) amphiphilic conetworks and gels: Molecularly forced blends of incompatible polymers with single glass transition temperatures of unusual dependence on the composition

Csaba Fodor, Tímea Stumphauser, Ralf Thomann, Yi Thomann, B. Iván

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A series of macroscopically homogeneous poly(N-vinylimidazole)-l-poly(propylene glycol) (PVIm-l-PPG) ("l" stands for "linked by") amphiphilic conetworks (APCNs) composed of otherwise incompatible polymers were successfully synthesized in a broad composition range (34-88 wt% PPG) by free radical copolymerization of hydrophilic N-vinylimidazole (VIm) and hydrophobic poly(propylene glycol) dimethacrylate (PPGDMA) macromolecular cross-linkers. Strikingly, while PVIm and PPGDMA homopolymers are immiscible and their blends have two distinct glass transition temperatures (Tg), the PVIm-l-PPG conetworks possess only one Tg indicating the absence of considerable phase separation in the conetworks, which was also confirmed by AFM measurements. This is in sharp contrast to the two Tgs of APCNs reported so far in the literature, on the one hand. On the other hand, the Tg values do not follow known correlations between Tg and composition, like the Fox equation or additive rule, widely applied for compatible polymers. These results indicate a strong interpolymer interaction on the molecular level between the PVIm and PPG chains in these new APCNs resulting in single Tg. Thermogravimetric analysis (TGA) shows that degradation of the conetworks occurs at high temperatures in two stages without sharp changes, but with a transition period in between. The DTG curves indicate that the components retain their chemical integrity to certain extent in these APCNs. The amphiphilic nature of the PVIm-l-PPG conetworks was confirmed by their composition dependent swelling in both polar (water, ethanol) and nonpolar (THF) solvents, that is in spite of the lack of phase separation, these new materials behave as either hydrogels or hydrophobic gels (organogels) depending on the swelling medium in a broad composition range.

Original languageEnglish
Pages (from-to)5375-5385
Number of pages11
JournalPolymer Chemistry
Volume7
Issue number34
DOIs
Publication statusPublished - Sep 14 2016

Fingerprint

Propylene Glycol
Transition Temperature
Glycols
Propylene
Glass
Polymers
Gels
Chemical analysis
Polypropylenes
Phase separation
Swelling
Hydrogels
Glass transition temperature
poly(4-vinylimidazole)
Homopolymerization
Free radicals
Copolymerization
Free Radicals
Thermogravimetric analysis
Ethanol

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Biomedical Engineering
  • Polymers and Plastics
  • Organic Chemistry

Cite this

@article{d4464305d2234c418066382a1ec57e40,
title = "Poly(: N -vinylimidazole)- l -poly(propylene glycol) amphiphilic conetworks and gels: Molecularly forced blends of incompatible polymers with single glass transition temperatures of unusual dependence on the composition",
abstract = "A series of macroscopically homogeneous poly(N-vinylimidazole)-l-poly(propylene glycol) (PVIm-l-PPG) ({"}l{"} stands for {"}linked by{"}) amphiphilic conetworks (APCNs) composed of otherwise incompatible polymers were successfully synthesized in a broad composition range (34-88 wt{\%} PPG) by free radical copolymerization of hydrophilic N-vinylimidazole (VIm) and hydrophobic poly(propylene glycol) dimethacrylate (PPGDMA) macromolecular cross-linkers. Strikingly, while PVIm and PPGDMA homopolymers are immiscible and their blends have two distinct glass transition temperatures (Tg), the PVIm-l-PPG conetworks possess only one Tg indicating the absence of considerable phase separation in the conetworks, which was also confirmed by AFM measurements. This is in sharp contrast to the two Tgs of APCNs reported so far in the literature, on the one hand. On the other hand, the Tg values do not follow known correlations between Tg and composition, like the Fox equation or additive rule, widely applied for compatible polymers. These results indicate a strong interpolymer interaction on the molecular level between the PVIm and PPG chains in these new APCNs resulting in single Tg. Thermogravimetric analysis (TGA) shows that degradation of the conetworks occurs at high temperatures in two stages without sharp changes, but with a transition period in between. The DTG curves indicate that the components retain their chemical integrity to certain extent in these APCNs. The amphiphilic nature of the PVIm-l-PPG conetworks was confirmed by their composition dependent swelling in both polar (water, ethanol) and nonpolar (THF) solvents, that is in spite of the lack of phase separation, these new materials behave as either hydrogels or hydrophobic gels (organogels) depending on the swelling medium in a broad composition range.",
author = "Csaba Fodor and T{\'i}mea Stumphauser and Ralf Thomann and Yi Thomann and B. Iv{\'a}n",
year = "2016",
month = "9",
day = "14",
doi = "10.1039/c6py00848h",
language = "English",
volume = "7",
pages = "5375--5385",
journal = "Polymer Chemistry",
issn = "1759-9954",
publisher = "Royal Society of Chemistry",
number = "34",

}

TY - JOUR

T1 - Poly(

T2 - N -vinylimidazole)- l -poly(propylene glycol) amphiphilic conetworks and gels: Molecularly forced blends of incompatible polymers with single glass transition temperatures of unusual dependence on the composition

AU - Fodor, Csaba

AU - Stumphauser, Tímea

AU - Thomann, Ralf

AU - Thomann, Yi

AU - Iván, B.

PY - 2016/9/14

Y1 - 2016/9/14

N2 - A series of macroscopically homogeneous poly(N-vinylimidazole)-l-poly(propylene glycol) (PVIm-l-PPG) ("l" stands for "linked by") amphiphilic conetworks (APCNs) composed of otherwise incompatible polymers were successfully synthesized in a broad composition range (34-88 wt% PPG) by free radical copolymerization of hydrophilic N-vinylimidazole (VIm) and hydrophobic poly(propylene glycol) dimethacrylate (PPGDMA) macromolecular cross-linkers. Strikingly, while PVIm and PPGDMA homopolymers are immiscible and their blends have two distinct glass transition temperatures (Tg), the PVIm-l-PPG conetworks possess only one Tg indicating the absence of considerable phase separation in the conetworks, which was also confirmed by AFM measurements. This is in sharp contrast to the two Tgs of APCNs reported so far in the literature, on the one hand. On the other hand, the Tg values do not follow known correlations between Tg and composition, like the Fox equation or additive rule, widely applied for compatible polymers. These results indicate a strong interpolymer interaction on the molecular level between the PVIm and PPG chains in these new APCNs resulting in single Tg. Thermogravimetric analysis (TGA) shows that degradation of the conetworks occurs at high temperatures in two stages without sharp changes, but with a transition period in between. The DTG curves indicate that the components retain their chemical integrity to certain extent in these APCNs. The amphiphilic nature of the PVIm-l-PPG conetworks was confirmed by their composition dependent swelling in both polar (water, ethanol) and nonpolar (THF) solvents, that is in spite of the lack of phase separation, these new materials behave as either hydrogels or hydrophobic gels (organogels) depending on the swelling medium in a broad composition range.

AB - A series of macroscopically homogeneous poly(N-vinylimidazole)-l-poly(propylene glycol) (PVIm-l-PPG) ("l" stands for "linked by") amphiphilic conetworks (APCNs) composed of otherwise incompatible polymers were successfully synthesized in a broad composition range (34-88 wt% PPG) by free radical copolymerization of hydrophilic N-vinylimidazole (VIm) and hydrophobic poly(propylene glycol) dimethacrylate (PPGDMA) macromolecular cross-linkers. Strikingly, while PVIm and PPGDMA homopolymers are immiscible and their blends have two distinct glass transition temperatures (Tg), the PVIm-l-PPG conetworks possess only one Tg indicating the absence of considerable phase separation in the conetworks, which was also confirmed by AFM measurements. This is in sharp contrast to the two Tgs of APCNs reported so far in the literature, on the one hand. On the other hand, the Tg values do not follow known correlations between Tg and composition, like the Fox equation or additive rule, widely applied for compatible polymers. These results indicate a strong interpolymer interaction on the molecular level between the PVIm and PPG chains in these new APCNs resulting in single Tg. Thermogravimetric analysis (TGA) shows that degradation of the conetworks occurs at high temperatures in two stages without sharp changes, but with a transition period in between. The DTG curves indicate that the components retain their chemical integrity to certain extent in these APCNs. The amphiphilic nature of the PVIm-l-PPG conetworks was confirmed by their composition dependent swelling in both polar (water, ethanol) and nonpolar (THF) solvents, that is in spite of the lack of phase separation, these new materials behave as either hydrogels or hydrophobic gels (organogels) depending on the swelling medium in a broad composition range.

UR - http://www.scopus.com/inward/record.url?scp=84984598137&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84984598137&partnerID=8YFLogxK

U2 - 10.1039/c6py00848h

DO - 10.1039/c6py00848h

M3 - Article

VL - 7

SP - 5375

EP - 5385

JO - Polymer Chemistry

JF - Polymer Chemistry

SN - 1759-9954

IS - 34

ER -