25 Years of Polymer Science as Reflected in <i>Macromolecular Rapid Communications</i>

The preparation of binary polymer blend nanocomposites with different nanomaterials is a relatively new approach to achieve desired physical, thermal, mechanical, and electrochemical properties because it has the collective effects of both polymer blending and fillers. Transition metal oxides constitute a large class among those fillers because the precursors for metal oxides are abundantly available. However, very few studies have been accomplished on incorporating transition metal oxides into binary polymer blends. In this project, cuprous oxide (CuO) nanoparticles (NPs) with a crystallite size of 24.95 nm were incorporated into poly(vinyl chloride)/poly(methyl methacrylate) (PVC/PMMA) blend, and thin films of the nanocomposites were obtained through a solution casting technique. Scanning electron microscopy, X‐ray diffraction, universal testing machine testing, thermogravimetric analysis, and cyclic voltammetry were used to study morphological, crystalline, mechanical, thermal, and electrochemical properties of the nanocomposites. Scanning electron micrographs showed that the blend was completely miscible and CuO NPs were well dispersed within the matrix. Mechanical properties greatly improved with each wt% addition of CuO NPs. Thermogravimetric analysis thermograms revealed a two‐stage degradation for neat PVC/PMMA blend and CuO/PVC/PMMA. Cyclic voltammetry results indicated a free electron transfer in neat blend that further improved with the incorporation of increasing percentage of CuO NPs. J. VINYL ADDIT. TECHNOL., 23:80–85, 2017. © 2015 Society of Plastics Engineers

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Investigation of thermal, mechanical and electrochemical properties of nanocomposites based on CuO modified poly(vinyl chloride)/poly(methyl methacrylate) blend

Ayaz

Ishaq

Saeed

et al. 2015

Vinyl Additive Technology

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Supramolecular Polypseudorotaxanes Composed of Star-Shaped Porphyrin-Cored Poly(ε-caprolactone) and α-Cyclodextrin

Dai

Dong

et al. 2006

Biomacromolecules

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Star-shaped porphyrin-cored poly(epsilon-caprolactone) (SPPCL) was synthesized using a tetrahydroxyethyl-terminated porphyrin as a core initiator and stannous octoate as a catalyst in bulk at 120 degrees C. The molecular weight of as-synthesized polymer could be adjusted linearly by controlling the molar ratio of epsilon-caprolactone to porphyrin core initiator, and the molecular weight distribution was reasonably narrow. Supramolecular polypseudorotaxanes were prepared by inclusion complexation of SPPCL with alpha-cyclodextrin (alpha-CD) and thoroughly characterized by means of FT-IR, 1H NMR, 13C CP/MAS NMR, DSC, TGA, and WAXD. The results demonstrated that the porphyrin-cored polypseudorotaxanes formed through alpha-CD molecules threading onto the branch chains of star-shaped SPPCL polymers, and they had a channel-type crystalline structure. Meanwhile, the original crystallization of SPPCL polymers within the polypseudorotaxanes was completely suppressed in the alpha-CD cavities. Moreover, inclusion complexation between SPPCL and alpha-CD enhanced the thermal stability of both the guest SPPCL polymers and the host alpha-CD. Furthermore, both the SPPCL polymers and the polypseudorotaxanes showed similar fluorescent and UV-vis spectra compared with porphyrin core initiator. Consequently, this will not only provide potentially porphyrin-cored poly(epsilon-caprolactone) and its polypseudorotaxanes for photodynamic therapy but also improve the compatibility between poly(epsilon-caprolactone) and peptide drugs for drug delivery.

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Supramolecular and Biomimetic Polypseudorotaxane/Glycopolymer Biohybrids: Synthesis, Glucose-Surfaced Nanoparticles, and Recognition with Lectin

2008

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A new class of supramolecular and biomimetic glycopolymer/poly(epsilon-caprolactone)-based polypseudorotaxane/glycopolymer triblock copolymers (poly(D-gluconamidoethyl methacrylate)-PPR-poly(D-gluconamidoethyl methacrylate), PGAMA-PPR-PGAMA), exhibiting controlled molecular weights and low polydispersities, was synthesized by the combination of ring-opening polymerization of epsilon-caprolactone, supramolecular inclusion reaction, and direct atom transfer radical polymerization (ATRP) of unprotected D-gluconamidoethyl methacrylate (GAMA) glycomonomer. The PPR macroinitiator for ATRP was prepared by the inclusion complexation of biodegradable poly(epsilon-caprolactone) (PCL) with alpha-cyclodextrin (alpha-CD), in which the crystalline PCL segments were included into the hydrophobic alpha-CD cavities and their crystallization was completely suppressed. Moreover, the self-assembled aggregates from these triblock copolymers have a hydrophilic glycopolymer shell and an oligosaccharide threaded polypseudorotaxane core, which changed from spherical micelles to vesicles with the decreasing weight fraction of glycopolymer segments. Furthermore, it was demonstrated that these triblock copolymers had specific biomolecular recognition with concanavalin A (Con A) in comparison with bovine serum albumin (BSA). To the best of our knowledge, this is the first report that describes the synthesis of supramolecular and biomimetic polypseudorotaxane/glycopolymer biohybrids and the fabrication of glucose-shelled and oligosaccharide-threaded polypseudorotaxane-cored aggregates. This hopefully provides a platform for targeted drug delivery and for studying the biomolecular recognition between sugar and lectin.

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25 Years of Polymer Science as Reflected in Macromolecular Rapid Communications

Cited by 4 publications

References 46 publications

Investigation of thermal, mechanical and electrochemical properties of nanocomposites based on CuO modified poly(vinyl chloride)/poly(methyl methacrylate) blend

Investigation of thermal, mechanical and electrochemical properties of nanocomposites based on CuO modified poly(vinyl chloride)/poly(methyl methacrylate) blend

Supramolecular Polypseudorotaxanes Composed of Star-Shaped Porphyrin-Cored Poly(ε-caprolactone) and α-Cyclodextrin

Supramolecular and Biomimetic Polypseudorotaxane/Glycopolymer Biohybrids: Synthesis, Glucose-Surfaced Nanoparticles, and Recognition with Lectin

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