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      저자 : Zhaobin Qiu (검색결과 2 건)
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      • KCI등재

        Crystallization Behaviors and Morphology of Novel Poly(octamethylene adipate-cooctamethylene succinate) and Poly(octamethylene adipate)

        Xiaojing Li,Zhaobin Qiu 한국고분자학회 2015 Macromolecular Research Vol.23 No.7

        Crystallization behaviors and morphology of novel biodegradable poly(octamethylene adipate-cooctamethylene succinate) (POAS) copolymers with different octamethylene succinate (OS) contents and their parent homopolymer poly(octamethylene adipate) (POA) were extensively investigated. Compared to POA, increasing the OS unit does not modify the crystal structures but slightly decreases the crystallinity values of POAS. The glass transition temperature values of POAS are greater than that of POA. Both the nonisothermal crystallization peak temperature and melting point temperature values of POAS decrease gradually with the increment of the OS unit. The overall isothermal melt crystallization rates of POAS decrease with increasing crystallization temperature and the OS content, while the crystallization mechanism does not change. The equilibrium melting point values of POAS are reduced with increasing the OS content, with respect to POA. The nucleation densities of POAS spherulites are reduce significantly; moreover, increasing crystallization temperature and the OS content reduces the spherulitic growth rates of POAS, relative to POA.

      • KCI등재

        Morphology, Crystallization and Mechanical Properties of Biodegradable Poly(butylene succinate-co-butylene carbonate)/Multi-Walled Carbon Nanotubes Nanocomposites

        Yuanyuan Zhao,Zhaobin Qiu 한국고분자학회 2014 Macromolecular Research Vol.22 No.7

        Biodegradable poly(butylene succinate-co-butylene carbonate) (PBSC)/carboxyl-functionalized multiwalledcarbon nanotubes (f-MWCNTs) nanocomposites were prepared through a solution and casting method at lowf-MWCNTs loadings. Scanning electron microscopy observations revealed a fine dispersion of f-MWCNTs in the PBSCmatrix. Both the nonisothermal and isothermal melt crystallization processes of PBSC were enhanced, apparently by thepresence of f-MWCNTs in the nanocomposites, because f-MWCNTs acted as an efficient heterogeneous nucleation agentfor the crystallization of PBSC. The crystallization mechanism remained unchanged for both neat PBSC and the PBSC/f-MWCNTs nanocomposites, regardless of crystallization temperature; moreover, the crystal structures of PBSCwere not modified by f-MWCNTs in the nanocomposites. The dynamical mechanical properties were also improvedin the nanocomposites. Upon incorporating only 1 wt% of f-MWCNTs, the storage modulus of PBSC improved byabout 30% at -60 oC. In addition, the glass transition temperature values of PBSC were increased slightly in the nanocomposites,relative to that of neat PBSC.

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