Bio-based cyclized Eucommia ulmoides gum elastomer for promising damping applications. Issue 72 (20th December 2019)

• Record Type: Journal Article
• Authors: Qi, Xin; Xie, Fei; Zhang, Jichuan; Zhang, Liqun; Yue, Dongmei
• Is Part Of: RSC advances. Volume 9:Issue 72(2019)
• Page Start: 42367
• Page End: 42374
• Publication Date: 2019-12-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra07856h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A cyclized Eucommia ulmoides gum (CEUG) elastomer with various degrees of cyclization for promising damping applications. Abstract : Eucommia ulmoides gum (EUG) is an important bio-based material with a structure similar to that of natural rubber. However, EUG is a hard plastic at room temperature due to crystallization, which limits its wide application. In this paper, a bio-based cyclized Eucommia ulmoides gum (CEUG) elastomer with various degrees of cyclization was prepared using TiCl4 /CH3 COOH as catalysts. 1 H-NMR and FT-IR techniques were used to obtain structure information. It was found that di-, tri-, and tetra-substituted olefins in the cyclized sequence were formed during cyclization. DSC and XRD results indicated that the cyclized structure could inhibit crystallization. When the degree of cyclization reached 8.2%, crystallization disappeared and the material transformed from a plastic into an elastomer. With increasing of the degree of cyclization, the glass transition temperature ( T g ) of CEUG increased and the thermal stability was enhanced, but the molecular weight decreased significantly. Above all, DMA results showed that the tan δ max could reach 1.2 when the degree of cyclization was 20.0%, and the damping temperature range could be adjusted by controlling the degree of cyclization. This new elastomer is expected to contribute to the development of damping materials.