Preparation and characterization of amorphous polyacrylonitrile

Imai, Yoshikatsu; Minami, Shunsuke; Yoshihara, Toshio; Joh, Yasushi; Satō, Hiroshi

doi:10.1002/pol.1970.110080413

Cited by 53 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 3 shows the 1 H NMR spectrum of the PAN obtained in n ‐hexane and THF mixture. This has besides H a (∼2.0 ppm) and H b (∼3.1 ppm) peaks shown in Scheme ,16 other peaks around 1.22 ppm, 1.39 ppm and 2.7 ppm. The peaks around 1.22 ppm and 1.39 ppm could be attributed to end methyl protons in the main chain and the terminal methyl protons in the branched structure, respectively.…”

Section: Resultsmentioning

confidence: 90%

Polymerization of acrylonitrile catalyzed by single yttrium tris(2,6‐di‐tert‐butyl‐4‐methyl phenolate)

Zheng

Zhang

Shen

2002

Polymer International

View full text Add to dashboard Cite

Polymerization of acrylonitrile was carried out using yttrium tris(2,6‐di‐tert‐butyl 4‐methyl‐phenolate) (Y(OAr)3) as single component catalyst for the first time. The effects of concentrations of the monomer and catalyst, kinds of rare earth element and solvent, as well as temperature and polymerization time were investigated. The overall activation energy of polymerization in n‐hexane and THF mixture is 18.3 kJ mol−1. Polyacrylonitriles (PANs) obtained by using Y(OAr)3 in n‐hexane and THF mixture at 50 °C are predominantly atactic, while yellow PANs obtained in DMF under the same conditions have a syndiotactic‐rich configuration (>50%), and their highly branched and/or cyclized structures have also been found. © 2002 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 90%

Polymerization of acrylonitrile catalyzed by single yttrium tris(2,6‐di‐tert‐butyl‐4‐methyl phenolate)

Zheng

Zhang

Shen

2002

Polymer International

View full text Add to dashboard Cite

show abstract

“…Trimellitic anhydride chloride has been used to synthesize poly(amide imide) by the low‐temperature polycondensation reaction of trimellitic anhydride chloride with diamines 9–13. In our research, we used bis( o ‐aminophenol) instead of diamine to react with trimellitic anhydride chloride to prepare poly(imide benzoxazole).…”

Section: Resultsmentioning

confidence: 99%

A novel synthesis method for the preparation of aromatic poly(imide benzoxazole) from trimellitic anhydride chloride and bis(o‐aminophenol)

Hsu

Chang

Huang

et al. 2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

A poly(imide benzoxazole) was prepared directly from trimellitic anhydride chloride and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (BisAPAF) monomers in a two-step method. In the first step, a poly-(hydroxyamide amic acid) precursor was synthesized by the low-temperature solution polymerization in an organic solvent. Subsequently, thermal cyclodehydration of the poly-(hydroxyamide amic acid) precursor at 350°C produced the corresponding poly(imide benzoxazole). The inherent viscosity of the precursor polymer was 0.22 dL/g. The cyclized poly(imide benzoxazole) showed a glass transition temperature (T g ) at 329°C and a 5% weight loss temperature at 530°C in nitrogen and at 525°C in air. The poly(imide benzoxazole) is amorphous as evidenced by the wide-angle X-ray diffraction measurement. The structures of the precursor polymer and the fully cyclized polymer were characterized by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance spectroscopy ( 1 H NMR).

show abstract

“…One group of investigators [1][2][3][4][5][6][7][8] believe in a two-phase structure for PAN and phenomena such as the glass transition, characteristic of the amorphous phase are frequently quoted for this polymer [2,4,9]. One group of investigators [1][2][3][4][5][6][7][8] believe in a two-phase structure for PAN and phenomena such as the glass transition, characteristic of the amorphous phase are frequently quoted for this polymer [2,4,9].…”

Section: Relaxation Time and Molar Free Energy Of Activation Of Polyamentioning

confidence: 99%

Relaxation time and molar free energy of activation of polyacrylonitrile

Chand¹

1981

J Mater Sci

View full text Add to dashboard Cite

Preparation and characterization of amorphous polyacrylonitrile

Cited by 53 publications

References 15 publications

Polymerization of acrylonitrile catalyzed by single yttrium tris(2,6‐di‐tert‐butyl‐4‐methyl phenolate)

Polymerization of acrylonitrile catalyzed by single yttrium tris(2,6‐di‐tert‐butyl‐4‐methyl phenolate)

A novel synthesis method for the preparation of aromatic poly(imide benzoxazole) from trimellitic anhydride chloride and bis(o‐aminophenol)

Relaxation time and molar free energy of activation of polyacrylonitrile

Contact Info

Product

Resources

About