Characterization and gas‐permeation properties of crosslinked diacetylene‐containing polymer membranes from ferulic acid

Abstract

Thermally and UV crosslinked poly[propargyl(3‐methoxy‐4‐propargyloxy) cinnamate] (PPOF) were investigated in terms of their physical, thermal, optical, and gas‐permeation properties. The crosslinked membranes had high gel contents because of the formation of a diacetylene network. The wide‐angle X‐ray diffraction patterns showed that all of the membranes were amorphous in structure, regardless of the type of crosslinking reaction. The membrane density increased after the crosslinking reaction; this suggested that the free volume of the crosslinked membrane was lower than that of the untreated membranes. Drastic color changes in the membranes were also observed because of the highly conjugated crosslinked network of diacetylene. In addition, the conjugation caused by diacetylene crosslinking led to visible absorption within the range 400–600 nm. The gas permeation of the crosslinked membrane was reduced compared with that of the untreated membranes. In particular, the gas permeability of the thermally crosslinked membrane was lower than that of UV‐irradiated membrane. On the basis of this result, the degree of crosslinking by thermal treatment was higher than that of UV irradiation. Hence, the crosslinked PPOF membranes showed improved gas‐barrier properties due to the high conjugation of the crosslinked diacetylene network induced by thermal treatment and UV irradiation. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Hyaluronan-based graft copolymers bearing aggregation-induced emission fluorogens

“…[7][8][9] Polymers containing FA in the main chain have also been proposed to obtain materials for sensing and/or imaging applications. [10][11][12][13][14][15][16] Aggregation induced emission (AIE) in biocompatible uorophores have gained much attention in recent years since AIE compounds, being weakly emissive or non-emissive in solution due to free intramolecular motions, become good emitters upon aggregation and therefore represent a class of excellent uorescent bioprobes. 17 The glycosaminoglycan hyaluronic acid (HA, hyaluronan) plays important roles in human body.…”

Development of biobased microwave absorbing composites with various magnetic metals and carbons

“…The development of functional biobased polymer materials has received much attention because of environmental concerns in recent years . Natural lacquer is a natural polyphenolic compound and is well known as a traditional natural crosslinked polymer.…”

Thermal properties of diacetylene–containing polymer prepared from propargyl-terminated monomer with pyridine

“…Besides thermal cross-linking property, highly reactive propargyl ether-terminated monomers can be used in the preparation of diacetylene-containing polymers by means of oxidative coupling chemistry under oxygen atmosphere with copper (I) chloride (CuCl) as the catalyst. [33][34][35][36] These obtained polymers can similarly undergo cross-linked polymerization under ultraviolet irradiation or by annealing at a definite temperature, and they exhibit enhanced mechanical properties and thermostability because of the volume contraction in the covalent coupling of adjacent diacetylene units. [35][36][37][38][39][40] In recent years, several correlative research studies have been reported on the synthesis and characteristics of diacetylene-containing polymers, for example, thermal properties and mechanical strength.…”

“…[33][34][35][36] These obtained polymers can similarly undergo cross-linked polymerization under ultraviolet irradiation or by annealing at a definite temperature, and they exhibit enhanced mechanical properties and thermostability because of the volume contraction in the covalent coupling of adjacent diacetylene units. [35][36][37][38][39][40] In recent years, several correlative research studies have been reported on the synthesis and characteristics of diacetylene-containing polymers, for example, thermal properties and mechanical strength. [38][39][40][41] Many of the cured products were characterized by good mechanical and thermal properties and chemical resistance.…”