Gpcmax ve 2001

PEtG with a 6-nitroveratryl carbonate end-cap and alkyne-PEtG were
synthesized as previously reported.^{16 (link)} PCL
(M_n = 55 kg/mol) was supplied by Scientific
Polymer Products, PLA (M_n = 103.5 kg/mol)
was purchased from 3D Solutech, and PHB (M_n = 550 kg/mol) was purchased from Goodfellow. CH₂Cl₂ was distilled from CaH₂ immediately before use.
THF and toluene were distilled from sodium/benzophenone and degassed
by three freeze–pump–thaw cycles before use. DMF was
obtained from a solvent purification system using aluminum oxide columns.
NMR spectra were recorded on a 600 MHz Varian INOVA 600 instrument
or with a 400 MHz Bruker AVIII HD 400 instrument. ¹H NMR
spectra were referenced to residual CHCl₃ (7.27 ppm). FTIR
spectra were obtained using a PerkinElmer FTIR spectrum two instrument
in attenuated total reflectance mode. SEC was performed in THF at
5 mg/mL of the polymer using a Viscotek GPCmax VE 2001 SEC instrument
equipped with an Agilent PolyPore guard column (PL1113-1500) and two
sequential Agilent PolyPore SEC columns packed with porous poly(styrene-co-divinylbenzene) particles (MW range: 200–2 000 000
g/mol; PL1113-6500) regulated at a temperature of 30 °C. Molar
masses were calculated relative to polystyrene standards with a correction
factor of 0.56 applied to the PCL samples.^{38 (link)}