利用动态光散射、透射电镜研究了嵌段共聚物聚苯乙烯 b 聚丙烯酸(PS b PAA)与均聚物聚苯乙烯(PS)在选择性溶剂水中的自组装行为.由于均聚物PS与PS嵌段具有相同的结构单元,均聚物PS参与胶束的形成,和嵌段共聚物的PS链段一同组成胶束的核...利用动态光散射、透射电镜研究了嵌段共聚物聚苯乙烯 b 聚丙烯酸(PS b PAA)与均聚物聚苯乙烯(PS)在选择性溶剂水中的自组装行为.由于均聚物PS与PS嵌段具有相同的结构单元,均聚物PS参与胶束的形成,和嵌段共聚物的PS链段一同组成胶束的核;在适当的均聚物分子量和含量条件下,PS b PAA PS可以自组装形成单分散的纳米胶束;通过改变体系中均聚物PS的分子量和含量可在较大范围内调变胶束的尺寸.展开更多
Poly（acrylic acid）/nylon1313 and polystyrene/nylon1313 blends were prepared usin g supercritical CO2 as both the substrate-swelling agent and the monomer/ initiator carrier. The desorption of CO2 from CO2-saturated ...Poly（acrylic acid）/nylon1313 and polystyrene/nylon1313 blends were prepared usin g supercritical CO2 as both the substrate-swelling agent and the monomer/ initiator carrier. The desorption of CO2 from CO2-saturated nylon1313 is li nearly dependent on the logarithm of time. Both IR and SEM data show the existen ce of the PAA or the PS phases within the nylon1313 matrix in the blends. Compar ed to nylon1313, the heat of fusion of CO2-plasticized nylon1313 is greater, and that of the CO2-plasticized PAA/nylon1313 and PS/nylon1313 blends are smaller.展开更多
用扫描电子显微镜对聚苯乙烯 b 聚丙烯酸 (PS b PAA)嵌段共聚物在水中自组装形貌进行了观察。结果表明 :外界环境和制样方法能够影响聚合物的自组装和聚集情况。 0℃时 ,PS38 b PAA2 10 胶束聚集形成纺锤状结构。而在临界条件下 ,缓慢...用扫描电子显微镜对聚苯乙烯 b 聚丙烯酸 (PS b PAA)嵌段共聚物在水中自组装形貌进行了观察。结果表明 :外界环境和制样方法能够影响聚合物的自组装和聚集情况。 0℃时 ,PS38 b PAA2 10 胶束聚集形成纺锤状结构。而在临界条件下 ,缓慢改变体系冷冻 解冻循环次数 ,则会得到这些纺锤结构的花状聚集体。展开更多
文摘利用动态光散射、透射电镜研究了嵌段共聚物聚苯乙烯 b 聚丙烯酸(PS b PAA)与均聚物聚苯乙烯(PS)在选择性溶剂水中的自组装行为.由于均聚物PS与PS嵌段具有相同的结构单元,均聚物PS参与胶束的形成,和嵌段共聚物的PS链段一同组成胶束的核;在适当的均聚物分子量和含量条件下,PS b PAA PS可以自组装形成单分散的纳米胶束;通过改变体系中均聚物PS的分子量和含量可在较大范围内调变胶束的尺寸.
文摘Poly（acrylic acid）/nylon1313 and polystyrene/nylon1313 blends were prepared usin g supercritical CO2 as both the substrate-swelling agent and the monomer/ initiator carrier. The desorption of CO2 from CO2-saturated nylon1313 is li nearly dependent on the logarithm of time. Both IR and SEM data show the existen ce of the PAA or the PS phases within the nylon1313 matrix in the blends. Compar ed to nylon1313, the heat of fusion of CO2-plasticized nylon1313 is greater, and that of the CO2-plasticized PAA/nylon1313 and PS/nylon1313 blends are smaller.
