Abstract
Imidazolium ionene segmented block copolymers were synthesized from 1,1′-(1,4-butanediyl)bis(imidazole) and 1,12-dibromododecane hard segments and 2000 g/mol PTMO dibromide soft segments. The polymeric structures were confirmed using 1H NMR spectroscopy, and resonances associated with methylene spacers from 1,12-dibromododecane became more apparent as the hard segment content increased. TGA revealed thermal stabilities ≥250 °C for all imidazolium ionene segmented block copolymers. These ionene segmented block copolymers containing imidazolium cations showed evidence of microphase separation when the hard segment was 6-38 wt%. The thermal transitions found by DSC and DMA analysis found that the Tg and Tm of the PTMO segments were comparable to PTMO polymers, namely approximately -80 °C and 22 °C, respectively. In the absence of PTMO soft segments the Tg increased to 27 °C The crystallinity of the PTMO segments was further evidence of microphase separation and was particularly evident at 6, 9 and 20 wt% hard segment, as indicated in X-ray scattering. The periodicity of the microphase separation was well-defined at 20 and 38 wt% hard segment and found to be approximately 10.5 and 13.0 nm, respectively, for these ionenes wherein the PTMO soft segment is 2000 g/mol. Finally, the 38 and 100 wt% hard segment ionenes exhibited scattering from correlations within the hard segment on a length scale of approximately 2-2.3 nm. These new materials present structure on a variety of length scales and thereby provide various routes to controlling mechanical and transport properties.
| Original language | English |
|---|---|
| Pages (from-to) | 1252-1257 |
| Number of pages | 6 |
| Journal | Polymer |
| Volume | 51 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2010 Mar 11 |
| Externally published | Yes |
Fingerprint
Keywords
- Imidazolium
- Ionenes
- X-ray scattering
ASJC Scopus subject areas
- Polymers and Plastics
- Organic Chemistry
Cite this
Ionene segmented block copolymers containing imidazolium cations : Structure-property relationships as a function of hard segment content. / Williams, Sharlene R.; Salas-de la Cruz, David; Winey, Karen I.; Long, Timothy Edward.
In: Polymer, Vol. 51, No. 6, 11.03.2010, p. 1252-1257.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ionene segmented block copolymers containing imidazolium cations
T2 - Structure-property relationships as a function of hard segment content
AU - Williams, Sharlene R.
AU - Salas-de la Cruz, David
AU - Winey, Karen I.
AU - Long, Timothy Edward
PY - 2010/3/11
Y1 - 2010/3/11
N2 - Imidazolium ionene segmented block copolymers were synthesized from 1,1′-(1,4-butanediyl)bis(imidazole) and 1,12-dibromododecane hard segments and 2000 g/mol PTMO dibromide soft segments. The polymeric structures were confirmed using 1H NMR spectroscopy, and resonances associated with methylene spacers from 1,12-dibromododecane became more apparent as the hard segment content increased. TGA revealed thermal stabilities ≥250 °C for all imidazolium ionene segmented block copolymers. These ionene segmented block copolymers containing imidazolium cations showed evidence of microphase separation when the hard segment was 6-38 wt%. The thermal transitions found by DSC and DMA analysis found that the Tg and Tm of the PTMO segments were comparable to PTMO polymers, namely approximately -80 °C and 22 °C, respectively. In the absence of PTMO soft segments the Tg increased to 27 °C The crystallinity of the PTMO segments was further evidence of microphase separation and was particularly evident at 6, 9 and 20 wt% hard segment, as indicated in X-ray scattering. The periodicity of the microphase separation was well-defined at 20 and 38 wt% hard segment and found to be approximately 10.5 and 13.0 nm, respectively, for these ionenes wherein the PTMO soft segment is 2000 g/mol. Finally, the 38 and 100 wt% hard segment ionenes exhibited scattering from correlations within the hard segment on a length scale of approximately 2-2.3 nm. These new materials present structure on a variety of length scales and thereby provide various routes to controlling mechanical and transport properties.
AB - Imidazolium ionene segmented block copolymers were synthesized from 1,1′-(1,4-butanediyl)bis(imidazole) and 1,12-dibromododecane hard segments and 2000 g/mol PTMO dibromide soft segments. The polymeric structures were confirmed using 1H NMR spectroscopy, and resonances associated with methylene spacers from 1,12-dibromododecane became more apparent as the hard segment content increased. TGA revealed thermal stabilities ≥250 °C for all imidazolium ionene segmented block copolymers. These ionene segmented block copolymers containing imidazolium cations showed evidence of microphase separation when the hard segment was 6-38 wt%. The thermal transitions found by DSC and DMA analysis found that the Tg and Tm of the PTMO segments were comparable to PTMO polymers, namely approximately -80 °C and 22 °C, respectively. In the absence of PTMO soft segments the Tg increased to 27 °C The crystallinity of the PTMO segments was further evidence of microphase separation and was particularly evident at 6, 9 and 20 wt% hard segment, as indicated in X-ray scattering. The periodicity of the microphase separation was well-defined at 20 and 38 wt% hard segment and found to be approximately 10.5 and 13.0 nm, respectively, for these ionenes wherein the PTMO soft segment is 2000 g/mol. Finally, the 38 and 100 wt% hard segment ionenes exhibited scattering from correlations within the hard segment on a length scale of approximately 2-2.3 nm. These new materials present structure on a variety of length scales and thereby provide various routes to controlling mechanical and transport properties.
KW - Imidazolium
KW - Ionenes
KW - X-ray scattering
UR - http://www.scopus.com/inward/record.url?scp=77649235557&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77649235557&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2009.06.051
DO - 10.1016/j.polymer.2009.06.051
M3 - Article
AN - SCOPUS:77649235557
VL - 51
SP - 1252
EP - 1257
JO - Polymer (United Kingdom)
JF - Polymer (United Kingdom)
SN - 0032-3861
IS - 6
ER -