期刊
CELLULOSE
卷 12, 期 5, 页码 527-541出版社
SPRINGER
DOI: 10.1007/s10570-005-7135-3
关键词
cellulose triacetate; diblock copolymer; differential scanning calorimetry; MALDI-TOF MS; microphase separation; oligoamide-15
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, H-1-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 T-g, T-c, and T-m transition temperatures. Their T-g and T-m values increased with the increase of molecular weight of CTA segment. The crystallinity of diblock copolymers increased after isothermal crystallization at 200 degrees 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 T-g and T-m values of polyamide-15 are -7 degrees C and 170-180 degrees C, respectively.
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