Synthesis and characterization of diblock, triblock, and multiblock copolymers containing Poly(3-hydroxy butyrate) units

A poly[(R,S)-3-hydroxybutyrate] macroinitiator (PHB-MI) was obtained through the condensation reaction of poly[(R,S)-3-hydroxybutyrate] (PHB) oligomers containing dihydroxyl end functionalities with 4,4'-azobis(4-cyanopentanoyl chloride). The PHB-MI obtained in this way had hydroxyl groups at two end of the polymer chain and an internal azo group. The synthesis of ABA-type PHB-b-PMMA block copolymers [where A is poly(methyl methacrylate) (PMMA) and B is PHB] via PHB-MI was accomplished in two steps. First, multiblock active copolymers with azo groups (PMMA-PHB-MI) were prepared through the redox free-radical polymerization of methyl methacrylate (MMA) with a PHB-MI/Ce(IV) redox system in aqueous nitric acid at 40°C. Second, PMMA-PHB-MI was used in the thermal polymerization of MMA at 60°C to obtain PHB-b-PMMA. When styrene (S) was used instead of MMA in the second step, ABCBA-type PMMA-b-PHB-b-PS multiblock copolymers [where C is polystyrene (PS)] were obtained. In addition, the direct thermal polymerization of the monomers (MMA or S) via PHB-MI provided AB-type diblocks copolymers with MMA and BCB-type triblock copolymers with S. The macroinitiators and block copolymers were characterized with ultraviolet-visible spectroscopy, nuclear magnetic resonance spectroscopy, gel permeation chromatography, cryoscopic measurements, and thermogravimetric analysis. The increases in the intrinsic viscosity and fractional precipitation confirmed that a block copolymer had been obtained. © 2004 Wiley Periodicals, Inc.

Dergi Adı Journal of Applied Polymer Science
Dergi Cilt Bilgisi 94
Dergi Sayısı 4
Sayfalar 1789 - 1796
Yayın Yılı 2004
Eser Adı
[dc.title]
Synthesis and characterization of diblock, triblock, and multiblock copolymers containing Poly(3-hydroxy butyrate) units
Yazar
[dc.contributor.author]
Arslan, Hülya
Yazar
[dc.contributor.author]
Menteş, Ayfer
Yazar
[dc.contributor.author]
Hazer, Baki
Yayın Yılı
[dc.date.issued]
2004
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
A poly[(R,S)-3-hydroxybutyrate] macroinitiator (PHB-MI) was obtained through the condensation reaction of poly[(R,S)-3-hydroxybutyrate] (PHB) oligomers containing dihydroxyl end functionalities with 4,4'-azobis(4-cyanopentanoyl chloride). The PHB-MI obtained in this way had hydroxyl groups at two end of the polymer chain and an internal azo group. The synthesis of ABA-type PHB-b-PMMA block copolymers [where A is poly(methyl methacrylate) (PMMA) and B is PHB] via PHB-MI was accomplished in two steps. First, multiblock active copolymers with azo groups (PMMA-PHB-MI) were prepared through the redox free-radical polymerization of methyl methacrylate (MMA) with a PHB-MI/Ce(IV) redox system in aqueous nitric acid at 40°C. Second, PMMA-PHB-MI was used in the thermal polymerization of MMA at 60°C to obtain PHB-b-PMMA. When styrene (S) was used instead of MMA in the second step, ABCBA-type PMMA-b-PHB-b-PS multiblock copolymers [where C is polystyrene (PS)] were obtained. In addition, the direct thermal polymerization of the monomers (MMA or S) via PHB-MI provided AB-type diblocks copolymers with MMA and BCB-type triblock copolymers with S. The macroinitiators and block copolymers were characterized with ultraviolet-visible spectroscopy, nuclear magnetic resonance spectroscopy, gel permeation chromatography, cryoscopic measurements, and thermogravimetric analysis. The increases in the intrinsic viscosity and fractional precipitation confirmed that a block copolymer had been obtained. © 2004 Wiley Periodicals, Inc.
Kayıt Giriş Tarihi
[dc.date.accessioned]
2019-12-23
Açık Erişim Tarihi
[dc.date.available]
2019-12-23
Yayın Dili
[dc.language.iso]
eng
Konu Başlıkları
[dc.subject]
Azo polymers
Konu Başlıkları
[dc.subject]
Block copolymers
Konu Başlıkları
[dc.subject]
Polystyrene
Konu Başlıkları
[dc.subject]
Radical polymerization
Künye
[dc.identifier.citation]
Arslan, H., Menteş, A. ve Hazer, B. (2004). Synthesis and characterization of diblock, triblock, and multiblock copolymers containing poly(3-hydroxy butyrate) units. Journal of Applied Polymer Science, 94(4), 1789-1796. doi:10.1002/app.21112
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
0021-8995
İlk Sayfa Sayısı
[dc.identifier.startpage]
1789
Son Sayfa Sayısı
[dc.identifier.endpage]
1796
Dergi Adı
[dc.relation.journal]
Journal of Applied Polymer Science
Dergi Sayısı
[dc.identifier.issue]
4
Dergi Cilt Bilgisi
[dc.identifier.volume]
94
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1002/app.21112
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/7731
Görüntülenme Sayısı ( Şehir )
Görüntülenme Sayısı ( Ülke )
Görüntülenme Sayısı ( Zaman Dağılımı )
Görüntülenme
193
09.12.2022 tarihinden bu yana
İndirme
1
09.12.2022 tarihinden bu yana
Son Erişim Tarihi
28 Mayıs 2024 10:49
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Tıklayınız
copolymers obtained polymerization PHB-MI PHB-b-PMMA multiblock [where poly[(R thermal spectroscopy groups through S)-3-hydroxybutyrate] characterized macroinitiators triblock BCB-type diblocks AB-type provided PMMA-b-PHB-b-PS monomers direct addition ABCBA-type polystyrene ultraviolet-visible magnetic nuclear fractional Periodicals copolymer confirmed precipitation viscosity
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