Yang LIU, Xiao-fei WANG, Chuan-ying SHI, Xiao-wen HUANG, Yan-yan WEI. Preparation and Properties of Crosslinked Polyamide Amide Gels Based on Hydrogen Bond Self-Repair[J]. Polymer Bulletin, 2020,33(1):31-46.
Yang LIU, Xiao-fei WANG, Chuan-ying SHI, Xiao-wen HUANG, Yan-yan WEI. Preparation and Properties of Crosslinked Polyamide Amide Gels Based on Hydrogen Bond Self-Repair[J]. Polymer Bulletin, 2020,33(1):31-46. DOI: 10.14028/j.cnki.1003-3726.2020.01.004.
The formation of polymer gels are judged by inverted test tube method and rheological test. The results show that these methods are effective during determining its formation. And according to the analysis of various factors affecting gel formation
it was found that the gels can be prepared when they are in the methanol solvent
R=1.25
50℃ and the monomer concentration (mass fraction) over 22%. Through the infrared analysis of polyamide amine (PAMAM)
N
N
-methylenebisacrylamide (MBA) and
N
-aminoethylpiperazine (AEPZ)
it shows that the chemical crosslinking reaction between MBA and AEPZ can be happened and PAMAM is then generated. And infrared analysis of PAMAM with LiBr and PAMAM with no LiBr showed that the cross-linked polyamide amine contained rich hydrogen bonds interaction
which provided a possibility for self-repair of the material. The equilibrium swelling ratio tests of PAMAM-1 (monomer concentration 22%)
PAMAM-2 (monomer concentration 27%) and PAMAM-3 (monomer concentration 32%) show that PAMAM-1 has the highest swelling ratio. Through the dynamic modulus tests
we know that the
G
' of PAMAM-1
PAMAM-2 and PAMAM-3 are 5000Pa
15000Pa and 24000Pa respectively
indicating that the gels had good elasticity and belonged to chemical crosslinking. The self-repairing process of the material was characterized by PAMAM-3
which indicated that the cross-linked polyamide amine can be repaired by hydrogen bonds and physical interaction