氢键交联聚异丁烯网络制备

Preparation of Supramolecular Hydrogen-Bonded Polyisobutylene Network

以3-氨基-5-乙酰胺-1,2,4-三氮唑(AATA)在相转移催化剂存在的条件下取代溴化异丁烯-对甲基苯乙烯共聚物弹性体(BI MS)中的溴原子,在高分子链上引入3-氨基-5-乙酰胺-1,2,4-三氮唑(AATA),利用其分子间的氢键自组装形成聚异丁烯网络。BI MS反应后溶液的比浓黏度增加,以及比浓黏度随着BI MS中AATA量的增加而急剧增加表明体系中形成了网络。文中还研究了反应时间、温度、AATA用量对反应的影响。结果表明,AATA在两相催化剂存在的条件下可以取代BI MS中的Br,但不能完全取代。当反应温度在75℃左右,AATA/Br为4/1(mol/mol),反应时间不超过8 h时,溴的取代率可以达到30%以上。

Poly （isobutylene-co-p-methyl-styrene-co-p-bromomethylstyrene） （BIMS） was modified with 3-arnino- 5-acetamino- 1,2,4-triazole（AATA） which is prone to self-complementary hydrogen-bonding. Drastic increase of the reduced viscosities of AATA-modified BIMS with increasing degree of modification and higher reduced viscosities compared to non-modified BIMS at different concentrations in solution indicate the hydrogen-bonded network in the modified BIMS is formed. The effect of reaction time, temperature and the amount of AATA on the modification of BIMS was also investigated. The results show the modification isn＇t quantitatively completed. The degree of modification can reach over 30% at 75 ℃, reaction time of over 8 h and ratio of AATA to Br in BIMS of 4/1（mol/ mol）, and tetrabutylammonium bromide as a phase transfer agent.