A dynamic polymer with a dynamic cross-linked structure
A dynamic cross-linking and polymer technology, applied in the field of intelligent polymers, can solve problems such as slowness, difficulty in stabilizing imine bonds, and poor stability of thiols
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[0261] In the above-mentioned preparation embodiment, it is also possible to selectively introduce a suitable amount of monofunctional organoboron compound (I) and / or monofunctional silicon-containing compound (II) components, which can be adjusted through component formulation , to obtain the dynamic cross-linked structure. Monofunctional compounds can play a role in adjusting crosslink density, dynamics, mechanical strength and so on.
[0262] In the preparation embodiment described above, the reaction of other reactive groups can also be achieved by introducing organic boronic acid groups and / or organic boronic acid ester groups, silicon hydroxyl and / or silicon hydroxyl precursors, organic boric acid silicon ester bonds However, compound components containing other reactive groups can be achieved together. The compound containing only other reactive groups can be any suitable compound that can achieve the reaction with other reactive groups in organoboron compound (I) and / ...
Embodiment 1
[0412] A dynamic polymer with a dynamic cross-linking structure is prepared by using a small-molecule organoboron compound (I) containing four functional groups and a small-molecule silicon-containing compound (II) containing two functional groups.
[0413]
[0414] Weigh a certain amount of organoboron compound (a) (using AIBN as the initiator and triethylamine as the catalyst, using vinylboronic acid, vinylboronic acid dibutyl ester and 1,6-hexanedithiol through thiol-ene click reaction Prepared) dissolved in tetrahydrofuran solvent to prepare a 0.8mol / L solution; Measure 40ml of tetrahydrofuran solution dissolved with organoboron compound and pour it into a dry and clean flask, add 4ml of deionized water, drop a little acetic acid and mix evenly, Slowly add the silicon-containing compound (b) of 5.02g therein again (utilize dimethylallyl chlorosilane, 1,10-decanedithiol as raw material, take AIBN as initiator, triethylamine as catalyst, pass thiol-ene click reaction prep...
Embodiment 2
[0416] A dynamic polymer with a dynamic cross-linking structure is prepared by using a small-molecule organoboron compound (I) containing four functional groups and a macromolecular silicon-containing compound (II) containing two functional groups.
[0417]
[0418]Add 15ml of phenylboronic acid-terminated polyethylene glycol (a) into a dry and clean three-necked flask (with polyethylene glycol 400 and 2-bromopropionyl bromide as raw materials and triethylamine as a catalyst to prepare dibromo-terminated polyethylene glycol (a) diol, and then it and 2-aminomethylphenylboronic acid are obtained through alkylation reaction to obtain the final product), heated to 80°C, in which a small amount of deionized water and acetic acid are added dropwise, and then 42ml of acetic acid is added dropwise under stirring The methoxysilane-modified silicone oil (b) (made from dimethylvinylmethoxysilane and hydrogen-terminated silicone oil with a viscosity of about 2000mPa·s as raw materials, ...
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