Fabrication, structures, and properties of acrylonitrile/methyl acrylate copolymers and copolymers containing microencapsulated phase change materials

Abstract

ABSTRACT:The polyacrylonitrile-methyl acrylate (AN/ MA mole ratio 100/0-70/30) copolymers and copolymers (AN/MA mole ratio 85/15) containing up to 40 wt % of microencapsulated n-octadecane (MicroPCMs) are synthesized in water. The MicroPCMs were incorporated at the step of polymerization. The effect of the MA mole ratio and MicroPCMs content on structures and properties of the copolymers were studied by using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance ( 1 H NMR), scanning electronic microscope (SEM), differential scanning calorimetry (DSC), thermogravimetry analysis (TG), gel permeation chromatography (GPC), and X-ray diffraction (XRD). The feeding ratio agreed well with the composition of the AN/MA copolymers. The copolymers are synthesized in the presence of MicroPCMs. The melting point moves to lower temperature (2068C), while the decomposition temperature moves to higher temperature (3098C) with increasing of the MA mole ratio and microcapsules content. The numberaverage molecular weight of the copolymer is $30,000. The crystallinity of the copolymer decreases with increasing of the MA mole ratio and microcapsules content.

Specific features of the copolymerization of acrylonitrile and acrylamide in the presence of low-molecular-mass and polymeric trithiocarbonates and properties of the obtained copolymers

“…Then, at f = 0.15-0.20, it shifts toward lower temperatures by ~10°C and broadens and thereafter (f = 0.25), in contrast, shifts by ~15°C toward higher temperatures. In [32], an extreme char acter of the acrylamide content effect on the maxi mum temperature of the exothermal peak was reported, but DSC curves were not presented. Accord ing to [22,24], less than 4 mol % acrylamide is suffi cient to noticeably decrease the onset temperature of PAN cyclization.…”

Preparation of bi‐continuous poly(acrylonitrile‐co‐methyl acrylate) microporous membranes by a thermally induced phase separation method

“…P(AN‐MA) was synthesized by a green and environmental emulsion polymerization based on our previous work (AN/MA molar ratios: 80/20; M w = 5.6 × 10 5 ; T m = 150–180 °C; T d = 317–325 °C). PAN ( M η = 50,000 g/mol) came from Anqing Petroleum Chemical Corporation of China.…”

Fabrication, structures and properties of Acrylonitrile/Vinyl acetate copolymers and copolymers containing microencapsulated phase change materials

“…4 Generally, there is at least one kind of comonomer in commercial PAN based copolymers, such as methyl acrylate(MA), methyl methacrylate(MMA), vinyl acetate(VAc), acrylamide(AM) and so on. 11, 12 Godshall, et al have demonstrated that the cyclization reaction, which transforms PAN into an insoluble, rigid structure, can be delayed by the presence of the comonomer. 5 Considering that VAc is an abundant, cheap and little toxic resource, it has been used as an alternative comonomer by some companies to produce PAN based fiber, such as Cydsa, Montefibre, Solutia and Faserwerke Lingen.…”