Catalyzing benzoxazine polymerization with borohydrides to reduce the cure temperature and coloring

Zeynep Deliballi; Baris Kiskan; Yusuf Yagci

doi:10.1016/j.eurpolymj.2022.111679

Catalyzing benzoxazine polymerization with borohydrides to reduce the cure temperature and coloring

Zeynep Deliballi
, Baris Kiskan^*
, Yusuf Yagci

^*Bu çalışma için yazışmadan sorumlu yazar

Kimya Bölümü

Istanbul Technical University

Araştırma çıktısı: Dergi yayını › Makale › Hakem

11 Atıf (Scopus)

Özet

Sodium cyanoborohydride (NaCNBH₃) and sodium borohydride (NaBH₄) were used as catalysts to lower the ring-opening polymerization (ROP) temperature of 1,3-benzoxazines. According to the dynamic scanning calorimeter (DSC) and Fourier transform infrared (FTIR) studies, the onset ROP temperatures of model benzoxazine were decreased by ca. 80 °C. The activation energies of catalyzed ROP were estimated by Kissinger and Ozawa methods. Moreover, the room temperature behavior of the catalysts in benzoxazine was revealed by ¹H NMR and FTIR, and it was found to be dormant at low temperatures and active after 170 °C. Besides catalytic activity, the borohydrides reduced the intense colorization of benzoxazines during curing, and the color changes of catalyzed and uncatalyzed polybenzoxazine samples were measured by colorimetry. Moreover, the thermal stabilities of the catalyzed polybenzoxazines were analyzed and compared to their un-catalyzed counterparts by thermal gravimetric analyses (TGA).

Orijinal dil	İngilizce
Makale numarası	111679
Dergi	European Polymer Journal
Hacim	181
DOI'lar	https://doi.org/10.1016/j.eurpolymj.2022.111679
Yayın durumu	Yayınlandı - 5 Ara 2022

Bibliyografik not

Publisher Copyright:
© 2022 Elsevier Ltd

Finansman

The authors would like to thank Istanbul Technical University Research Fund (Project No. 43365). One of the authors, Z.D., would like to thank YOK for the 100/2000 doctoral scholarship and the TUBITAK 2211-A National Graduate Scholarship.

Finansörler	Finansör numarası
Istanbul Technical University Research Fund	43365
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu

Belgeye Erişim

10.1016/j.eurpolymj.2022.111679

Diğer Dosyalar ve Linkler

Link to publication in Scopus

Alıntı Yap

@article{4d3c7c4fc7194a6fb34d519396a808dc,

title = "Catalyzing benzoxazine polymerization with borohydrides to reduce the cure temperature and coloring",

abstract = "Sodium cyanoborohydride (NaCNBH3) and sodium borohydride (NaBH4) were used as catalysts to lower the ring-opening polymerization (ROP) temperature of 1,3-benzoxazines. According to the dynamic scanning calorimeter (DSC) and Fourier transform infrared (FTIR) studies, the onset ROP temperatures of model benzoxazine were decreased by ca. 80 °C. The activation energies of catalyzed ROP were estimated by Kissinger and Ozawa methods. Moreover, the room temperature behavior of the catalysts in benzoxazine was revealed by 1H NMR and FTIR, and it was found to be dormant at low temperatures and active after 170 °C. Besides catalytic activity, the borohydrides reduced the intense colorization of benzoxazines during curing, and the color changes of catalyzed and uncatalyzed polybenzoxazine samples were measured by colorimetry. Moreover, the thermal stabilities of the catalyzed polybenzoxazines were analyzed and compared to their un-catalyzed counterparts by thermal gravimetric analyses (TGA).",

keywords = "Borohydrides, Catalyst, Coloring, Polybenzoxazine, Ring-opening polymerization",

author = "Zeynep Deliballi and Baris Kiskan and Yusuf Yagci",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

year = "2022",

month = dec,

day = "5",

doi = "10.1016/j.eurpolymj.2022.111679",

language = "English",

volume = "181",

journal = "European Polymer Journal",

issn = "0014-3057",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Catalyzing benzoxazine polymerization with borohydrides to reduce the cure temperature and coloring

AU - Deliballi, Zeynep

AU - Kiskan, Baris

AU - Yagci, Yusuf

PY - 2022/12/5

Y1 - 2022/12/5

N2 - Sodium cyanoborohydride (NaCNBH3) and sodium borohydride (NaBH4) were used as catalysts to lower the ring-opening polymerization (ROP) temperature of 1,3-benzoxazines. According to the dynamic scanning calorimeter (DSC) and Fourier transform infrared (FTIR) studies, the onset ROP temperatures of model benzoxazine were decreased by ca. 80 °C. The activation energies of catalyzed ROP were estimated by Kissinger and Ozawa methods. Moreover, the room temperature behavior of the catalysts in benzoxazine was revealed by 1H NMR and FTIR, and it was found to be dormant at low temperatures and active after 170 °C. Besides catalytic activity, the borohydrides reduced the intense colorization of benzoxazines during curing, and the color changes of catalyzed and uncatalyzed polybenzoxazine samples were measured by colorimetry. Moreover, the thermal stabilities of the catalyzed polybenzoxazines were analyzed and compared to their un-catalyzed counterparts by thermal gravimetric analyses (TGA).

AB - Sodium cyanoborohydride (NaCNBH3) and sodium borohydride (NaBH4) were used as catalysts to lower the ring-opening polymerization (ROP) temperature of 1,3-benzoxazines. According to the dynamic scanning calorimeter (DSC) and Fourier transform infrared (FTIR) studies, the onset ROP temperatures of model benzoxazine were decreased by ca. 80 °C. The activation energies of catalyzed ROP were estimated by Kissinger and Ozawa methods. Moreover, the room temperature behavior of the catalysts in benzoxazine was revealed by 1H NMR and FTIR, and it was found to be dormant at low temperatures and active after 170 °C. Besides catalytic activity, the borohydrides reduced the intense colorization of benzoxazines during curing, and the color changes of catalyzed and uncatalyzed polybenzoxazine samples were measured by colorimetry. Moreover, the thermal stabilities of the catalyzed polybenzoxazines were analyzed and compared to their un-catalyzed counterparts by thermal gravimetric analyses (TGA).

KW - Borohydrides

KW - Catalyst

KW - Coloring

KW - Polybenzoxazine

KW - Ring-opening polymerization

UR - https://www.scopus.com/pages/publications/85141334984

U2 - 10.1016/j.eurpolymj.2022.111679

DO - 10.1016/j.eurpolymj.2022.111679

M3 - Article

AN - SCOPUS:85141334984

SN - 0014-3057

VL - 181

JO - European Polymer Journal

JF - European Polymer Journal

M1 - 111679

ER -

Catalyzing benzoxazine polymerization with borohydrides to reduce the cure temperature and coloring

Özet

Bibliyografik not

Finansman

Belgeye Erişim

Diğer Dosyalar ve Linkler

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