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Journals / Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering / 2021 / Cilt: 22 - Sayı: 1

EFFECT OF POLYBUTADIENE COMPOSITION ON THE GLASS TRANSITION TEMPERATURE OF SBS BLOCK COPOLYMERS

Serhat GÜNDÜZ
Yavuz SAR
Kaan ÇAKTI
Pages
45–54
Publication Date
2021-03-26
DOI
—
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

However, it is observed that the Tg-onset values are directly proportional to the percentage of the 1,2-vinyl units and inversely proportional to the percentage of the trans-1,4 units in the SBS block copolymers.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Gel permeation chromatography (GPC), nuclear magnetic resonance (NMR) spectroscopy, and elemental analysis techniques were used to study the molecular characteristics of six commercially available styrene-butadiene-styrene (SBS) block copolymers which are mostly used for modifying bitumen.
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Key Findings & Data:The cis-1,4, trans-1,4, and 1,2-vinyl units in the polybutadiene (PB) parts and the styrene contents of the SBS block copolymers were investigated by means of 1H-NMR spectra.
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Conclusion & Impact:However, it is observed that the Tg-onset values are directly proportional to the percentage of the 1,2-vinyl units and inversely proportional to the percentage of the trans-1,4 units in the SBS block copolymers.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:SBS · Block copolymers · GPC

Abstract

Gel permeation chromatography (GPC), nuclear magnetic resonance (NMR) spectroscopy, and elemental analysis techniques were used to study the molecular characteristics of six commercially available styrene-butadiene-styrene (SBS) block copolymers which are mostly used for modifying bitumen. The cis-1,4, trans-1,4, and 1,2-vinyl units in the polybutadiene (PB) parts and the styrene contents of the SBS block copolymers were investigated by means of 1H-NMR spectra. In addition carbon and hydrogen contents were estimated using 1H-NMR measurements. These estimated values were confirmed using the results of elemental analysis (EA). The glass transition temperatures (Tg) of SBS block copolymers were obtained using differential scanning calorimetry (DSC). The SBS block copolymers used in this study have different structural properties such as molecular weight and linearity. However, it is observed that the Tg-onset values are directly proportional to the percentage of the 1,2-vinyl units and inversely proportional to the percentage of the trans-1,4 units in the SBS block copolymers.

Özet

Gel permeation chromatography (GPC), nuclear magnetic resonance (NMR) spectroscopy, and elemental analysis techniques were used to study the molecular characteristics of six commercially available styrene-butadiene-styrene (SBS) block copolymers which are mostly used for modifying bitumen. The cis-1,4, trans-1,4, and 1,2-vinyl units in the polybutadiene (PB) parts and the styrene contents of the SBS block copolymers were investigated by means of 1H-NMR spectra. In addition carbon and hydrogen contents were estimated using 1H-NMR measurements. These estimated values were confirmed using the results of elemental analysis (EA). The glass transition temperatures (Tg) of SBS block copolymers were obtained using differential scanning calorimetry (DSC). The SBS block copolymers used in this study have different structural properties such as molecular weight and linearity. However, it is observed that the Tg-onset values are directly proportional to the percentage of the 1,2-vinyl units and inversely proportional to the percentage of the trans-1,4 units in the SBS block copolymers.

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Cite This Article

GÜNDÜZ, S., SAR, Y., ÇAKTI, K. (2021). EFFECT OF POLYBUTADIENE COMPOSITION ON THE GLASS TRANSITION TEMPERATURE OF SBS BLOCK COPOLYMERS. Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering, Cilt: 22 - Sayı: 1, 45–54. https://ajindex.com/articles/196562

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