Besides a stable phase, shape-memory polymers require an additional switchable moiety. In addition to thermal transitions and supramolecular interactions, these units can also be based on covalent bonds. Herein, the use of reversible thiol-ene reaction as cross-linker for design is demonstrated. A facile route polymer networks with acceptor comonomer (butyl methacrylate or 2-ethylhexyl methacry...

While crystallization behavior of isotactic polypropylene homopolymers had been subject to a wide range experimental and modeling studies, this is not the case for propylene-ethylene random copolymers (PPR). This class polymers offers up now significant challenges, both from an as well perspective. The ethylene incorporation in propylene chains, distribution comonomer, has marked effect on kine...

A series of approximately 50:50 mol % poly(L-lactide-co-ε-caprolactone) copolymers were synthesized by bulk copolymerization of L-lactide (LL) and ε-caprolactone (CL) using stannous octoate (Sn(Oct) 2 ) and diethylene glycol (DEG) as the initiating system. The resulting P(LL-co-CL) copolymers were characterized by various analytical techniques including dilute-solution viscometry, GPC, H/C NMR ...

A novel active biocatalytic reaction system is proposed by covalently immobilizing porcine pancreas trypsin within the thermoresponsive polymer shell of superparamagnetic Fe₃O₄ nanoparticles.Active ester-functional nanocarriers suitable for the immobilization of amino functional targets are obtained in a single polymerization step by grafting-from copolymerization of an active ester monomer fro...

Statistical copolymers of norbornene (NBE) with cyclopentene (CP) were prepared by ring-opening metathesis polymerization, employing the 1st-generation Grubbs' catalyst, in the presence or absence of triphenylphosphine, PPh₃. The reactivity ratios were estimated using the Finemann-Ross, inverted Finemann-Ross, and Kelen-Tüdos graphical methods, along with the computer program COPOINT, which eva...

A strategy that is often used for designing low band gap polymers involves the incorporation of electron-rich (donor) and electron-deficient (acceptor) conjugated segments within the polymer backbone. In this paper we investigate such a series of Diketopyrrolopyrrole (DPP)-based co-polymers. The co-polymers consisted of a DPP unit attached to a phenylene, naphthalene, or anthracene unit. Additi...

Recent investigations of supramolecular polymers based on chiral triphenylene-2,6,10-tricarboxamides (TTAs) showed how temperature-induced changes in solvation can greatly influence the preferred helical conformation formed. Here, we combine TTA with achiral copolymerization partners to further investigate temperature-dependent effects. Systematic variation system's composition shows clear impa...

Abstract The discovery that polyethylene oxide promotes ionic conductivity led to the development of solid polymer electrolytes. However, their is severely reduced by crystallinity. Here, statistical copolymerization used design macromolecular architectures where crystallinity disrupted a minimal amount non-ethylene comonomer units. Using Flory exclusion model, we demonstrate polymers containin...