TY - JOUR
T1 - Aqueous polypropylene glycol induces swelling and severe plasticization of high
T2 - T gamphiphilic copolymers containing hexafluoroisopropanol groups
AU - Li, Siyuan
AU - Vogt, Bryan D.
N1 - Funding Information:
This work was supported by the National Science Foundation under grant no. CMMI-1462284. The authors thank Promerus LLC (Brecksville, OH) for providing the copolymer used in this study and Kazi Sadman for the Matlab code used to fit the QCM-D data to the power-law model. This code is open source and can be downloaded at: https://github.com/sadmankazi/ QCM-D-Analysis-GUI.
Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2020/7/21
Y1 - 2020/7/21
N2 - Poly(ethylene glycol) (PEG) tends to be considered low fouling, which has led to its use in a wide variety of applications. Amphiphilic polyols, such as Antifoam 204, are commonly used as surfactants in fermentation processes due to their limited toxicity and low cost, but these polyols in aqueous solutions can unexpectedly swell membranes. Here we examine the interactions of PEG or poly(propylene glycol) (PPG) with amphiphilic substituted norbornene copolymers through swelling in dilute aqueous solution. The effect of molecular mass (Mn) of the polyol (PEG and PPG) in aqueous (1 wt% butanol) solution on the swelling and mechanical properties of a series of poly(alkyl norbornene-co-hexafluoroisopropanol norbornene) is systematically investigated using a quartz crystal microbalance with dissipation. At 10 ppm of PEG, the swelling is less than 20% for all of the copolymers examined and the swelling is independent of PEG Mn. Although PPG at the lowest Mn examined leads to similar swelling to PEG, the swelling induced by PPG increases with Mn to reach a maximum at Mn = 3.1 kg mol-1. Pluronic L121 is similar compositionally to Antifoam 204, but the equilibrium swelling is decreased by nearly a factor of 2, which is attributed to the higher Mn of Pluronic L121. The limited dependence on the alkyl chain in the copolymer suggest that the interactions between the polyol and hexafluoroisopropanol moiety in the copolymer drive the uptake by the membrane through bound water with the unassociated ether in the PPG that increases swelling with increasing Mn, but a finite size effect limits the swelling for sufficiently large polymer additives. This journal is
AB - Poly(ethylene glycol) (PEG) tends to be considered low fouling, which has led to its use in a wide variety of applications. Amphiphilic polyols, such as Antifoam 204, are commonly used as surfactants in fermentation processes due to their limited toxicity and low cost, but these polyols in aqueous solutions can unexpectedly swell membranes. Here we examine the interactions of PEG or poly(propylene glycol) (PPG) with amphiphilic substituted norbornene copolymers through swelling in dilute aqueous solution. The effect of molecular mass (Mn) of the polyol (PEG and PPG) in aqueous (1 wt% butanol) solution on the swelling and mechanical properties of a series of poly(alkyl norbornene-co-hexafluoroisopropanol norbornene) is systematically investigated using a quartz crystal microbalance with dissipation. At 10 ppm of PEG, the swelling is less than 20% for all of the copolymers examined and the swelling is independent of PEG Mn. Although PPG at the lowest Mn examined leads to similar swelling to PEG, the swelling induced by PPG increases with Mn to reach a maximum at Mn = 3.1 kg mol-1. Pluronic L121 is similar compositionally to Antifoam 204, but the equilibrium swelling is decreased by nearly a factor of 2, which is attributed to the higher Mn of Pluronic L121. The limited dependence on the alkyl chain in the copolymer suggest that the interactions between the polyol and hexafluoroisopropanol moiety in the copolymer drive the uptake by the membrane through bound water with the unassociated ether in the PPG that increases swelling with increasing Mn, but a finite size effect limits the swelling for sufficiently large polymer additives. This journal is
UR - http://www.scopus.com/inward/record.url?scp=85088134112&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85088134112&partnerID=8YFLogxK
U2 - 10.1039/d0sm00747a
DO - 10.1039/d0sm00747a
M3 - Article
C2 - 32568344
AN - SCOPUS:85088134112
VL - 16
SP - 6362
EP - 6370
JO - Soft Matter
JF - Soft Matter
SN - 1744-683X
IS - 27
ER -