Aqueous polypropylene glycol induces swelling and severe plasticization of high T <sub>g</sub>amphiphilic copolymers containing hexafluoroisopropanol groups

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

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Work Title Aqueous polypropylene glycol induces swelling and severe plasticization of high T <sub>g</sub>amphiphilic copolymers containing hexafluoroisopropanol groups
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Open Access
Creators
  1. Siyuan Li
  2. Bryan D. Vogt
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Soft Matter
Publication Date July 21, 2020
Publisher Identifier (DOI)
  1. https://doi.org/10.1039/d0sm00747a
Deposited November 15, 2021

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