| Título: | Chemical and Rheological Characteristics of Thermally Stable Kraft Lignin Polycondensates Analyzed by Dielectric Properties |
| Autores: |
Duong, Le Dai; Department of Energy Science, Sungkyunkwan University Luong, Nguyen Dang; Polymer Technology, Department of Biotechnology and Chemical Technology, Aalto University, School of Chemical Technology, P.O. Box 16100, 00076 Aalto, Finland Binh, Nguyen Thi Thanh; Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon, South Korea Park, In-Kyung; Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon, South Korea Lee, Seong Hoon; Hyundai Motors Company, South Korea Kim, Dea Sik; Hyundai Motors Company, South Korea Lee, Yong Sang; Sogang University, South Korea Lee, Young Kwan; Department of Chemical Engineering, Sungkyunkwan University, Suwon, South Korea Kim, Byung Woo; Department of Chemical Engineering, Sungkyunkwan University, Suwon, South Korea Kim, Kwang Ho; Department of Materials Science Engineering, Korea University, Seoul 136-713, South Korea Yoon, Ho Kyu; Department of Materials Science Engineering, Korea University, Seoul 136-713, South Korea Yun, Ju Ho; Korea Automotive Technology Institute, South Korea Nam, Jae-Do; Department of Energy Science, Sungkyunkwan University, Suwon, South Korea; Deparment of Polymer Science and Engineering, Sungkyunkwan University, Suwon, South Korea |
| Fecha: | 2013-05-01 |
| Publicador: | Bioresources |
| Fuente: |
 |
| Tipo: |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| Tema: | Lignin; Polycondensate; Polycaprolactone; Biodegradable polymer; Eco-friendly |
| Descripción: | In light of the difficulties and disagreements in determining the property-processing structure relations of lignin-based polymers, dielectric analysis was used to identify the thermal and rheological characteristics of a lignin-based polycondensate and the pristine lignin. Using dielectric analysis, the pristine lignin with Mw=6000 g/mol, was clearly identified as giving the wet glass transition temperature (Tg,wet) and the evolution of gases (i.e., burning) at around 80 ºC to 125 ºC followed by subsequent cross-linking reactions over 150 ºC to give the dry glass transition temperature (Tg,dry) of lignin at around 130 ºC to 140 ºC. Connecting the lignin macromers using sequential condensation reactions with caprolactone and sebacoyl chloride, the lignin based polycaprolactone (LigPCL) polycondensates were synthesized as a thermoplastic polymer composed of lignin macromers and aliphatic polyester chains with Mw=10500 g/mol. The synthesized LigPCL presented good thermal stability and rheological melting behavior without evolving odor or fumes. In particular, the T2% (defined at 2% of weight loss) of the LigPCL and pristine lignin were 200 ºC and 80 ºC, respectively. The melt viscosity was measured at 103Pa.s at 120 ºC, ensuring facile melt-blending processing with various commodity polymers to be used in eco-friendly polymer composite development. |
| Idioma: | Inglés |