Structural transitions in poly(acrylonitrile) in alkaline hydrolysis – spectroscopic data

Romanova, E. P.; Rumynskaya, I. G.; Agranova, S. A.; Frenkel, S.Ya.

doi:10.1002/actp.1989.010401006

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…It is well known that nitrile groups, which exist in ABS, can be hydrolyzed with sodium hydroxide at a certain high temperature to obtained amide groups and similar structures, such as amidine and glutarimide, etc 34–36. The hydrolysis products were then initiated and co‐polymerized with ε ‐caprolactam during the polymerization process to improve the compatibility between MCPA6 and ABS.…”

Section: Resultsmentioning

confidence: 99%

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Morphology and Thermal Properties of MCPA6/ABS by in situ Polymerization of ε‐Caprolactam

Hou

Yang

2005

Macro Chemistry & Physics

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Summary: In this work, blends of monomer casting polyamide 6 (MCPA6) and acrylonitrile‐butadiene‐styrene (ABS) were successfully prepared by in situ polymerization via the application of ε‐caprolactam as a reactive solvent. The morphology and thermal properties of MCPA6/ABS were investigated by means of wide angle X‐ray diffraction (WAXD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), respectively. The domain sizes of the ABS phase in MCPA6/ABS blends were much finer than those in corresponding polyamide 6 (PA6)/ABS blends prepared by simple melt blending. With an increased amount of ABS in MCPA6, the melt enthalpy (ΔHf), the rate of crystallization (Tc) and the degree of crystallinity (Xc(DSC)) of MCPA6 in MCPA6/ABS blends were all decreased. The degree of supercooling (ΔTd) showed a contrary trend. However, the melting temperatures of these blends were almost unchanged. All the results could be attributed to in situ polymerization and the hydrolysis reaction of ABS that occurred during the polymerization process. Furthermore, WAXD results showed that only α‐form crystals existed in the MCPA6/ABS blends, despite the ABS content and heat treatment.

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Section: Resultsmentioning

confidence: 99%

“…[34][35][36] The hydrolysis products were then initiated and co-polymerized with e-caprolactam during the polymerization process to improve the compatibility between MCPA6 and ABS.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Morphology and Thermal Properties of MCPA6/ABS by in situ Polymerization of ε‐Caprolactam

Hou

Yang

2005

Macro Chemistry & Physics

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Transformations of poly(methacrylonitrile) in solutions at the addition of alkali

et al. 1991

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Act8 Polyrnoric8 a2 (1991) Nr. 6 2 f O RIJMYNSKAYA, ROMANOVA r t al. : 'lhiisfornia tinns of poly(tnctliacr~lo~iit.rilc) in soliitions number of bobbins or a different construction of the tcmpering surface.The schemc for calculations of nielt relaxation process described here permits to evaluate t h e degree of relaxation of the macromolecules during the tempering of the melt under different technological conditions or, conversely, t o find tempering conditions required for the complete relaxation of the system. Lcliingl;itl/USSR The kinetics of cliangcs of electronic spectra of poly(metliacrylo~iitrilc) in DMSO on aclilition of alkali was studied. The spectral picture depends on ttic amount of a k i l i corresponding to nnc chain unit, the amount of wntcr in the solutiun, and tlic alkali/watcr ratio. Bcsidcs, the inasimal attainablc effective length of conjugation of cyclic scquences is all tlic niore the lower is the rate of initiation of cyclization. -4 slow and unsubstantial decreasc of the intrinsic viscosity csclritles the occurrence of a sharp coil-globule transition on alkaline hydrolysis of poly(mctliacrylonitrilc). Urnwandlungen von Pol~(rne1liacnjlnilril) in LG8urzg bei zugahe oon AlltaliDie Kinetik dcr Andcrungen dcr clcktronischcn Spektrcn von Poly(mctIlacryloitril) in DMSO bei Zugabc vnn Alkali wurdc itntcrsucht. Das Ausschcn dcs Spcktrums hiingt von dcr Mcngc an Alkali bczogC.cn auf einc Einlieit der Polymerkettc nb, sowie vom Wassergchalt tler Liisung und vom Alkali/Wasser-VcrliaItnis. Die maximal erreichbare effcktivc Liingc dcr Konjugat,ion cyclischer Sequenzcn ist urn so griiRcr, je nicdrigcr die Initiierungsgcschwindigkcit der Cyclisicrung ist. Die beobachtcte gcringc Abnaliinc dcr Grcnzviskositat schlicDt dns Auftreten eincs scliarfen Ifbergangs vom Kniiuel xur kompaktcll Kugel bei dcr alkalisclien Hydrolysc des Poly(mctliacryliiitril)s aus.

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Morphology and thermal behavior of MCPA6/SAN blends prepared by anionic ring‐opening polymerization of ϵ‐caprolactam

Hou

Yang

2006

J of Applied Polymer Sci

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ABSTRACT:In this article, a series of blends of monomer casting polyamide 6 and styrene-co-acrylonitrile (MCPA6/ SAN) were prepared by in situ anionic ring-opening polymerization of -caprolactam. Their morphology and thermal behaviors were investigated by means of scanning electron microscope, differential scanning calorimeter, and wide-angle X-ray diffraction (WAXD), respectively. The SAN phase had much finer domain in MCPA6/SAN than that in the PA6/SAN blends prepared by melt blending of PA6 and SAN. All the melting and crystallization parameters of MCPA6/SAN blends decreased gradually with the increase of SAN content, while the melting temperature was almost unchanged. These results were due to the hydrolysis reaction of SAN that occurred during the anionic polymerization of -caprolactam. In addition, WAXD results showed that only ␣ crystal forms existed in the MCPA6/SAN blends. In addition, the mechanical property of MCPA6 was improved obviously by incorporating a certain amount of SAN.

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Structural transitions in poly(acrylonitrile) in alkaline hydrolysis – spectroscopic data

Cited by 9 publications

References 3 publications

Morphology and Thermal Properties of MCPA6/ABS by in situ Polymerization of ε‐Caprolactam

Morphology and Thermal Properties of MCPA6/ABS by in situ Polymerization of ε‐Caprolactam

Transformations of poly(methacrylonitrile) in solutions at the addition of alkali

Morphology and thermal behavior of MCPA6/SAN blends prepared by anionic ring‐opening polymerization of ϵ‐caprolactam

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