A High‐Lignin‐Content, Removable, and Glycol‐Assisted Repairable Coating Based on Dynamic Covalent Bonds

Abstract

Supporting Information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.Scheme1.(a) Synthesisofm odified lignin (L-COOH)from KL and MHHPA. (b) Curing reaction of L-COOH and PEG-epoxy and illustration of transesterification reaction within the crosslinkednetwork.

Spherical lignin particles: a review on their sustainability and applications

“…(ii) reproducibility (iii) easy application and cost-effectiveness (iv) tailored surface morphology and (v) environmental friendliness. 131 Spherical lignin particles seem beneficial regarding many of the above requirements, since lignin can provide surfaces with UV-protection, 132 corrosion inhibition, 133,134 antimicrobial activity, 129,130 removable/self-healable, 135 as well as fire-retardant 136 and drug release properties, 137 making lignin attractive for functional coating purposes.…”

Strong, Reusable, and Self‐Healing Lignin‐Containing Polyurea Adhesives

“…Besides, the interfacial compatibility between lignin and polyurea matrix was significantly improved after modifying lignin with long chain polyethermine, which has been confirmed in our previous work. [19] Consequently, the higher reactivity and the improved compatibility of D2000-grafted lignin generated the lignincontaining polyurea adhesives with stronger cohesion. In addition, when substituting D2000 with the same amount of pristine lignin or D2000-grafted lignin, the sample LC-10 performed better adhesion on substrates than sample L-10.…”

“…The weight average molecular of lignin after pretreatment was 1.2 kDa, with the molecular weight distribution index of 3.3. The polyetheramine D2000-grafted lignin was prepared according to the method reported in our previous work [19] and named as LC. The specific preparation process was provided in the Supporting information.…”

“…For example, Gan et al [18] developed a plantinspired hydrogel adhesive with Ag-lignin nanoparticles, which could construct the dynamic catechol redox system to endow the hydrogel with repeatable adhesiveness. Hao et al [19] modified Kraft lignin with carboxylic acid groups and then used it to synthesize lignin-containing PEG-epoxy coatings. The dynamic transesterification network endowed the coatings with excellent reparability at elevated temperatures.…”

“…In our previous work, we also developed high performance lignin-containing polyurethane elastomers containing dynamic covalent bonds, [21] which could undergo the transcarbamoylation reaction endowing the elastomers with reprocessability. Conclusively, the reported lignin-containing dynamic cross-linking networks were mainly constructed on the basis of dynamic catechol redox, [18] transesterification reaction, [19] Diels-Alder reaction [22] and transcarbamoylation reaction. [21] The dynamic disulfide bonds have been rarely applied in the lignin-based polymers.…”