Abstract: The polymer comprises units of formula (I) and of formula (Ibis), being comprised the molar ratio between units (I) and (Ibis) comprised from 1.0:0.2 to 1.0:0.8, and wherein R4 are independently selected from radicals of formula (II), (III), and (IV), R1 and R1? are independently selected from: —H, (C1-C20)alkyl, (C5-C14)aryl, —OR5, —(CO)R6, —O(CO)R7, —(SO)R8, —NH—CO—R9, —COOR10, —NR11R12, —NO2, and halogen; R2, R2?, R3, and R3? are —H; P is a polymeric chain, R5 to R12 are independently selected: —H, (C1-C20)alkyl, and (C5-C14)aryl;R13 and R14 are independently selected from (C1-C5)alkyl, and (C5-C14)aryl;, m is from 3 to 4; n is from 1 to 2; and p is from 1 to 2 provided that n+m+p sums 6; the polymer comprising from 5 to 25 weight % of urea moieties, and having H-bonding and pi-pi staking interactions between the urea groups, and a tensile strength comprised from 3 to 15 MPa.

Abstract: The composite comprises (i) a reinforcement phase comprising fibres, this phase being in a volume percentage comprised from 25 to 70% with respect to the total volume of the composite, and (ii) a matrix phase which is in a volume percentage comprised from 30 to 75% with respect to the total volume of the composite, being the sum of volumes of both phases forming the composite 100%, and wherein the matrix phase comprises a cured epoxy resin in a percentage comprised from 50-100% by weight with respect to the total weight of the matrix phase, and the cured epoxy resin being obtainable by: (a) mixing an epoxide-functionalised resin with a functionality equal to or higher than 2 with a cross-linking agent of formula (I), and (b) curing the reaction mixture at a temperature comprised from 10 to 200° C., this step being performed in the absence of a catalyst. The composite is reprocessable, reparable and recyclable and shows mechanochromic behaviour, being useful in the manufacture of an article.

Abstract: The self-healing cross-linked polymer comprises units of formula (I), wherein: P is a polymeric chain, R1 and R1? are independently selected from the group consisting of: —H, (C1-C20)alkyl, (C5-C14)aryl, —OR4, —(CO)R5, —O(CO)R6, —(SO)R7, —NH—CO—R8, —COOR9, —NR10R11, —NO2, and halogen; R2, R2?, R3 and R3? are independently selected from the group consisting of: —H, (C1-C20)alkyl and (C5-C14)aryl; R4 to R11 are the same or different, and are selected from the group consisting of: —H, (C1-C20)alkyl, and (C5-C14)aryl; m is from 3 to 4; n is from 1 to 2; provided that n+m is 5; the polymer having H-bonding interactions and being able to undergo catalyst free aromatic disulfide metathesis at room-temperature, and having a tensile strength value from 0.5 to 1.5 MPa and an elongation at break value higher than 200% at room-temperature.