Complex interactions in aqueous PIL-PNIPAm-PIL triblock copolymer solutions.

Erno Karjalainen; Vitaliy Khlebnikov; Antti Korpi; Sami-Pekka Hirvonen; Sami Hietala; Vladimir Aseyev; Heikki Tenhu

doi:10.1016/j.polymer.2014.12.054

Complex interactions in aqueous PIL-PNIPAm-PIL triblock copolymer solutions.

Erno Karjalainen
, Vitaliy Khlebnikov
, Antti Korpi
, Sami-Pekka Hirvonen
, Sami Hietala
, Vladimir Aseyev
, Heikki Tenhu^*

^*Corresponding author for this work

Not published at VTT

University of Helsinki

Research output: Contribution to journal › Article › Scientific › peer-review

21 Citations (Scopus)

Abstract

Triblock copolymers with a poly(N-iso-Pr acrylamide) (PNIPAm) central block and short cationic polymeric ionic liq. (PIL) endblocks were synthesized via ATRP. The chem. different blocks interact with each other and thus the presence and length of the PIL blocks affected the aggregation behavior of the thermoresponsive polymers at temps. below and above the cloud point.The PIL-PNIPAm interactions decreased the enthalpy of phase sepn. at the cloud point not only in the case of block copolymers but also in mixts. of corresponding homopolymers. However, the decrease in Î”H was not directly proportional to the no. of IL units present. This indicates that the IL units do not solely complex with the NIPAm units, but the PILs also interact with each other. The morphol. of the aggregates is different with different lengths of the PIL blocks. At higher concns. the block copolymers formed stable gels upon heating due to the phase transition of PNIPAm and the solubilizing effect of the PIL blocks.

Original language	English
Pages (from-to)	180-188
Journal	Polymer
Volume	58
DOIs	https://doi.org/10.1016/j.polymer.2014.12.054
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

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title = "Complex interactions in aqueous PIL-PNIPAm-PIL triblock copolymer solutions.",

abstract = "Triblock copolymers with a poly(N-iso-Pr acrylamide) (PNIPAm) central block and short cationic polymeric ionic liq. (PIL) endblocks were synthesized via ATRP. The chem. different blocks interact with each other and thus the presence and length of the PIL blocks affected the aggregation behavior of the thermoresponsive polymers at temps. below and above the cloud point.The PIL-PNIPAm interactions decreased the enthalpy of phase sepn. at the cloud point not only in the case of block copolymers but also in mixts. of corresponding homopolymers. However, the decrease in {\^I}”H was not directly proportional to the no. of IL units present. This indicates that the IL units do not solely complex with the NIPAm units, but the PILs also interact with each other. The morphol. of the aggregates is different with different lengths of the PIL blocks. At higher concns. the block copolymers formed stable gels upon heating due to the phase transition of PNIPAm and the solubilizing effect of the PIL blocks.",

author = "Erno Karjalainen and Vitaliy Khlebnikov and Antti Korpi and Sami-Pekka Hirvonen and Sami Hietala and Vladimir Aseyev and Heikki Tenhu",

year = "2015",

doi = "10.1016/j.polymer.2014.12.054",

language = "English",

volume = "58",

pages = "180--188",

journal = "Polymer",

issn = "0032-3861",

}

TY - JOUR

T1 - Complex interactions in aqueous PIL-PNIPAm-PIL triblock copolymer solutions.

AU - Karjalainen, Erno

AU - Khlebnikov, Vitaliy

AU - Korpi, Antti

AU - Hirvonen, Sami-Pekka

AU - Hietala, Sami

AU - Aseyev, Vladimir

AU - Tenhu, Heikki

PY - 2015

Y1 - 2015

N2 - Triblock copolymers with a poly(N-iso-Pr acrylamide) (PNIPAm) central block and short cationic polymeric ionic liq. (PIL) endblocks were synthesized via ATRP. The chem. different blocks interact with each other and thus the presence and length of the PIL blocks affected the aggregation behavior of the thermoresponsive polymers at temps. below and above the cloud point.The PIL-PNIPAm interactions decreased the enthalpy of phase sepn. at the cloud point not only in the case of block copolymers but also in mixts. of corresponding homopolymers. However, the decrease in Î”H was not directly proportional to the no. of IL units present. This indicates that the IL units do not solely complex with the NIPAm units, but the PILs also interact with each other. The morphol. of the aggregates is different with different lengths of the PIL blocks. At higher concns. the block copolymers formed stable gels upon heating due to the phase transition of PNIPAm and the solubilizing effect of the PIL blocks.

AB - Triblock copolymers with a poly(N-iso-Pr acrylamide) (PNIPAm) central block and short cationic polymeric ionic liq. (PIL) endblocks were synthesized via ATRP. The chem. different blocks interact with each other and thus the presence and length of the PIL blocks affected the aggregation behavior of the thermoresponsive polymers at temps. below and above the cloud point.The PIL-PNIPAm interactions decreased the enthalpy of phase sepn. at the cloud point not only in the case of block copolymers but also in mixts. of corresponding homopolymers. However, the decrease in Î”H was not directly proportional to the no. of IL units present. This indicates that the IL units do not solely complex with the NIPAm units, but the PILs also interact with each other. The morphol. of the aggregates is different with different lengths of the PIL blocks. At higher concns. the block copolymers formed stable gels upon heating due to the phase transition of PNIPAm and the solubilizing effect of the PIL blocks.

U2 - 10.1016/j.polymer.2014.12.054

DO - 10.1016/j.polymer.2014.12.054

M3 - Article

SN - 0032-3861

VL - 58

SP - 180

EP - 188

JO - Polymer

JF - Polymer

ER -

Complex interactions in aqueous PIL-PNIPAm-PIL triblock copolymer solutions.

Abstract

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