Novel Poly(tetramethylene ether)glycol and Poly(ε-caprolactone) Based Dynamic Network via Quadruple Hydrogen Bonding with Triple-Shape Effect and Self-Healing Capacity

Abstract

A novel dynamic network was successfully prepared via self-complementary quadruple hydrogen bonding through Upy-telechelic poly(tetremethylene ether) glycol (PTMEG) and four-arm star-shaped poly(ε-caprolactone) ((4)PCL) precursors. The structure and the dynamic feature were identified by FT-IR and (1)H NMR. The differential scanning calorimetry (DSC) analysis indicated that the crystalline PCL and PTMEG segments show a separated melting peak, and the aggregation of Upy dimer was also observed. The dynamic mechanical analyzer (DMA) test reveals that the storage modulus of the network drops evidently across the thermal transition. These characteristics of the network ensure that it exhibits a triple-shape effect, and the composition of the network influences the performance of shape memory effect. The variation of the fixing ratio of the network in each deformation step is quite according to the crystallinity of the dominant segment. The reversibility of the quadruple hydrogen bonding between Upy dimer endues the network with self-healing capacity, and the damage and healing test of the network revealed that increasing the content of the PTMEG segment will be of benefit to self-healing performance.

Linear shear and nonlinear extensional rheology of unentangled supramolecular side-chain polymers

“…Supramolecular polymers based on UPy groups have been widely investigated and materials with important characteristics such as stimuli-responsive [23], self-healing [10,11,[49][50][51][52] and temperature responsive [53,54] properties have found applications within printing [55][56][57][58], cosmetics [59,60], adhesives [61] and coatings [62]. As an example of how supramolecular associations can play an important role, for inkjet printing applications a UPy-modified polyether mixed with stabilizers, antioxidants and colourants was used in work by Jaeger et al [55].…”

Supramolecular Cross-Links in Poly(alkyl methacrylate) Copolymers and Their Impact on the Mechanical and Reversible Adhesive Properties

“…[4][5][6] Depending on the supramolecular motif, this is possible by exposure to chemicals 6 or solvents, 7 change of pH 8 or temperature, 9 irradiation with light, [9][10] application of electricity, [11][12] redox environments, 13 amongst others. The quadruple hydrogen-bonded 2-ureido- 4[1H]pyrimidinone (UPy) motif, which features a high dimerization constant and is easy to synthesize and functionalize, 7,14 has become a widely utilized building block in many supramolecular polymers, 1,7,[14][15][16][17][18][19][20][21][22] both as a linear chain extender [23][24][25] and as a cross-linker. 19,[21][22]25 Initial work on UPycontaining supramolecular polymers focused on studies in solution, before the advantages of reversible bond formation in the context of melt-processing were explored.…”

Micromachined Shape-Memory-Alloy Microactuators and Their Application in Biomedical Devices

“…In TRSME, the material can recover from temporary shape to original shape through two intermediate predefined shapes. Unlike the SMPs that have much attention from researchers of the TRSME [81][82][83][84], the research progress of such effect in SMA is somehow stagnant. To the best knowledge of the authors, the only study of TRSME in SMA is reported by Tang et al [85].…”