Heterotelechelic silicones: Facile synthesis and functionalization using silane-based initiators

The synthetic utility of heterotelechelic polydimethylsiloxane (PDMS) derivatives is limited due to challenges in preparing materials with high chain-end fidelity. In this study, anionic ring-opening polymerization (AROP) of hexamethylcyclotrisiloxane (D3) monomer using a specifically designed silyl hydride (Si–H)-based initiator provides a versatile approach towards a library of heterotelechelic PDMS polymers. A novel initiator, where the Si–H terminal group is connected to a C atom (H–Si–C) and not an O atom (H–Si–O) as in traditional systems, suppresses intermolecular transfer of the Si–H group, leading to heterotelechelic PDMS derivatives with a high degree of control over chain-ends. In-situ termination of the D3 propagating chain end with commercially available chlorosilanes (alkyl chlorides, methacrylates, and norbornenes) yields an array of chain-end functionalized PDMS derivatives. This diversity can be further increased by hydrosilylation with functionalized alkenes (alcohols,..., Nuclear magnetic resonance spectroscopy
1H-, 13C- and 29Si-NMR spectra were collected on a Bruker Avance NEO 500 MHz using chloroform as a deuterated solvent. IR spectra was measured with a Thermo Nicolet iS10 FTIR spectrometer equipped with a Smart Diamond attenuated total reflectance (ATR) accessory.
Size exclusion chromatography
Size exclusion chromatography (SEC) was measured using Waters e2695 separation module with a Waters 2414 differential refractive index detector equipped with two columns (PLgel, 5 μm MiniMIX-D, 250×4.6 mm columns + guard) with chloroform containing 0.25% TEA at 35 °C as the mobile phase.
Matrix assisted laser desorption ionization-time of flight mass spectrometry
MALDI-TOF MS spectrometry was measured using a Bruker Microflex LRF MALDI TOF mass spectrometer in positive reflection mode; the analyte, matrix (DCTB) were dissolved in chloroform at the concentration of 2.5 and 10 mg/mL respectively, and cationization agent (NaTFA) was dissolved in chloroform at c..., , # Heterotelechelic silicones: Facile synthesis and functionalization using silane-based initiators

Data files are organized into one folder: with the manuscript and supporting information. This folder is related to the publication which includes the manuscript and supporting information document.
 
All data can be opened as a .csv file using Excel or google sheets (free alternative)
 
Data files are organized as follows:
manuscript -> Figure number -> figure sub-category
Within each data file, there are tabs for each unique trace. The tab is denoted as the trace identifier. Some trace identifiers are label names.

Compounds are denoted as such: hexamethylcyclotrisiloxane (D3), Polydimethylsiloxane (PDMS), Methacrylate (MA), Norborene (Nb), Chloropropyl (Cl), Hydride (H), Polystyrene (PS).

Figures that are pictures and illustrations will not be included in the folders. This includes Figure 1, Scheme 1, Figure 5, and Figure 8.
 
All data is supplied in two columns (x,y) these co...