Graft copolymers prepared by ethoxylation of polyamide 12 and poly(ethylene-co-vinyl alcohol)

Nylon Surface Modification: 2. Nylon-Supported Composite Films

“…N -Alkylation with GPTES. t -BuOK (0.2244 g, 2 mmol) and 18-c-6 (0.0745 g, 0.2 mmol) were added to a Schlenk flask containing a stir bar and the nylon film samples in a drybox. The flask was then closed and removed from the drybox, and 25 mL of anhydrous THF was introduced via cannula.…”

Bottlebrush Polymers by Anionically Growing Poly(ethylene oxide) from Poly(vinyl alcohol) via Azeotrope Enabled Anionic Polymerization

“…Although not commonly reported, colored species in PEO polymerization has been reported previously. 21,22 The striking color evolution observed during polymerization is attributed to the formation of ordered lyotropic liquid crystalline domains exhibiting structural color. We propose that this phenomenon is driven by ion-mediated self-assembly of the growing bottlebrush polymer.…”

Controlled Anionic Graft Polymerization of Ethylene Oxide Directly from Poly(N-isopropylacrylamide)

“…For a better modulation of the properties of PEO-based graft copolymers, synthetic methodologies have been developed for controlling molecular weight, composition, side chain length, and distribution. ,− Nevertheless, the preparation of PNIPAM- g -PEO has achieved quite limited development. To our knowledge, two conventional methods have been involved so far, namely, the coupling of end-functionalized PEO onto PNIPAM with reactive moieties (“grafting onto”) , and the copolymerization of NIPAM with PEO macromonomer (“grafting through”). , However, from a chemical point of view, neither of these two methods can achieve absolutely random distribution of PEO chains along the backbone.…”

“…The graft polymerization of ethylene oxide (EO) from backbones with multifunctional initiating sites has been employed quite often. − Such a “grafting from” technique is able to achieve a better control of the synthesis and a wide variety of molecular characteristics compared to the other two techniques mentioned above. The main disadvantages are the use of metal-based catalysts as well as the necessity of incorporating functional moieties into the backbone polymer, − which inevitably inflicts complexity on the synthetic procedures and doubt about the randomness of the side chain distribution.…”

“…It is known that amide moieties in the backbone polymer can be deprotonated by a strong base, thus generating anionic initiating sites to polymerize EO. , In our previous work, the phosphazene base, t -BuP 4 , has opened a new pathway to PEO-based linear and graft copolymers via metal-free anionic polymerization. , Therefore, we were inspired to take advantage of both t -BuP 4 and secondary amide moieties in PNIPAM, so as to create anionic initiating sites and grow PEO directly from PNIPAM backbone (Scheme ). By this approach, the synthesis of PNIPAM- g -PEO would be greatly simplified since the introduction of functional moieties is avoided.…”