摘要
几种线性高分子量的无定型聚芳醚砜 (酮 )在非质子极性溶剂二甲基乙酰胺 (DMAc)和二甲基甲酰胺 (DMF)中 ,以氟化铯 (CsF)为催化剂进行解聚成环 ,所得环状低聚物由凝胶渗透色谱 (GPC)、高效液相色谱 (HPLC)和激光质谱 (MALDI TOF MS)确认 ,其中酚酞聚醚砜 (PES C)和酚酞聚醚酮 (PEK C)的解聚成环率分别高达 86.3 %和 87.9% .讨论了影响成环率的各种因素 .环状产物又在阴离子引发剂联苯双酚钾的作用下进行开环聚合重新得到高分子量的线性产物 .
Three amorphous aromatic polyether sulfone(ketone)s with different structures underwent a cyclo-depolymerization reaction using CsF as the catalyst in dipolar aprotic solvents such as DMAc and DMF to afford corresponding cyclic oligomer products. The results were confirmed by GPC, HPLC and MALDI-TOF-MS. The yields of phenolphthalein polyether sulfane (PES-C) and phenolphthalein polyether ketone (PEK-C) cyclics reach as high as 86.3% and 87.9% respectively. Relative factors that influence the yields of cyclics were discussed. High molecular weight linear products were regenerated after the ring-opening polymerization of the cyclo-products using potassium phenoxide as initiator.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第14期1344-1348,J005,共6页
Acta Chimica Sinica
基金
国家自然科学基金 (No .2 0 0 840 0 1 )资助项目
