NUCLEATION AND CRYSTALLIZATION OF H-SHAPED(PS)_2PEG(PS)_2 BLOCK COPOLYMERS

• 作 者: 石彤非 安立佳
• 机 构: State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry, Chin
• 出 处: Chinese Journal of Polymer Science
• 发表日期: 2010年03期
• 关键词: copolymer calorimetry nucleation shaped dispersed narrow annealing blocks crysta

A series of H-shaped(PS)_2PEG(PS)_2 block copolymers with different PS chain lengths were prepared.The influence of different confinements active on the crystallization and self-nucleation(SN) behavior of the PEG blocks was investigated by differential scanning calorimetry(DSC).When the content of the crystalline block was high,a classical SN behavior was obtained.The block copolymer with PEG content of 49%(by weight) showed a classical SN behavior with a narrow self-nucleation domain and had bimodal crystallization exotherms.When the PEG dispersed as separated microdomains in the block copolymer,the self-nucleation domain disappeared and only annealing was observed.

A series of H-shaped (PS) _2PEG (PS) _2 block copolymers with different PS chain lengths were prepared. The influence of different confinements on the crystallization and self-nucleation (SN) behavior of the PEG blocks was investigated by differential scanning showed that the block copolymer with PEG content of 49% (by weight) showed a classical SN behavior with a narrow self-nucleation domain and had bimodal crystallization exotherms. Who the PEG dispersed as separated microdomains in the block copolymer, the self-nucleation domain disappeared and only annealing was observed.