Benzophenone

PDMS, monohydride terminated
(AB250915, viscosity 5–9 cSt.) (M_n = 1136 g/mol determined by ¹H NMR end-group analysis),
was purchased from ABCR. Karstedt’s catalyst (platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane
complex solution in xylene, Pt ≈ 2%), allyl alcohol, 4-(dimethylamino)pyridine
(DMAP), N,N′-diisopropylcarbodiimid
(DIC, 18.4 mL, 122.4 mmol, 3.4 equiv), 5-norbornene-2-carboxylic acid
(mixture of endo and exo, predominantly endo), 5-norbornene-2-carbonitrile, first-generation Grubbs’
catalyst, 2,2-dimethoxy-2-phenylacetophenone (DMPA), and 2,2′-(ethylenedioxy)diethanethiol
(CL) were purchased from Sigma-Aldrich. Poly(vinyl alcohol)
(PVA, R&G-PVA-Folientrennmittel) was purchased from Suter-Kunststoff
AG. Methanol (MeOH), dichloromethane (DCM), ethyl acetate (EA), toluene
(Tol), tetrahydrofuran (THF), and heptane were purchased from VWR.
All chemicals were of reagent grade and used without purification;
only toluene was dried over sodium using benzophenone as an indicator
and DCM over calcium hydride and distilled before use.

Methanol, ethanol, benzophenone (BP), MgSO₄, NaCl, MgCl₂, NaSO_4, acrylic acid (AA), and phosphate-buffered saline (PBS) tablets were purchased from VWR (Atlanta, GA, USA). Bovine serum albumin (BSA) was supplied by Lee BioSolution (Maryland Heights, MO, USA). Congo red and Eriochrome^® Black T(EBT) were procured from Sigma-Aldrich (St. Louis, MO, USA). DI water was used in all experiments. Commercial polyvinylidene fluoride (PVDF) 400kDa membrane was provided by the UltraTM, Oceanside, CA. Commercial nanofiltration membrane NF270, NF90, and NF245 were provided by DuPont Water Solutions (Midland, MI, USA).