| Autor: |
Hiroshi Kamitakahara, Yukiko Enomoto, Chinatsu Hasegawa, Fumiaki Nakatsubo |
| Zdroj: |
Cellulose; Oct2005, Vol. 12 Issue 5, p527-541, 15p |
| Abstrakt: |
Well-defined A-block-B type cellulose derivatives consisting of cellulose triacetate (CTA) and oligoamide-15 were synthesized. Chemical structures of the diblock copolymers were characterized by MALDI-TOF MS, 1H-NMR, and GPC. Influence of length of CTA and oligoamide-15 segments on their thermal properties was investigated by means of differential scanning calorimetry (DSC). All diblock copolymers displayed Tg, Tc, and Tm transition temperatures. Their Tg and Tm values increased with the increase of molecular weight of CTA segment. The crystallinity of diblock copolymers increased after isothermal crystallization at 200 °C. Its X-ray analysis revealed that the diblock copolymer had CTA II crystal structure. Thermal analysis supported microphase separation between CTA and oligoamide-15 segments at room temperature, because Tg and Tm values of polyamide-15 are −7 °C and 170–180 °C, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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