Colophony of traditional hot solid sex is not frit not the covalent cross-linking polymer of dissolve, after discarding, reclaim hard and recycle. In recent years, pass degradation technology and reversible chemistry (or dynamic chemistry) innovation, colophony of sex of new-style heat solid realized closed circuit to reclaim, printed the domain such as material to get applied in composite material, 3D. This overview explain, realize colophony of sex of new-style heat solid to reach its the methodological cent that downstream material closed circuit reclaims is two kinds. One kind is to be in acidity, alkalescent or the hydrolyze in activator solution is hot solid sex colophony, reclaim next monomer or oligomer, these monomer or oligomer can repeat use preparation to heat up solid sex material or its function material. Another kind is the exchange that bolts through trends answer colophony of hot solid sex to undertake solving cross-linking and new cross-linking. In recent years, all sorts of can come off (or dynamic) key, the key that be like ester, shrink aldehyde key, Xi Fu key of alkaline, 2 sulfur, 6 hydrogen the key of ester of 3 Qin structure, boric acid hot firm that already was used at preparation closed circuit to be able to reclaim sexual colophony, its closed circuit reclaims mechanism already also got sufficient demonstration. Use the strategy that hydrolysis closed circuit circulates, colophony of reclaiming hot solid sex has as identical as primitive colophony structure and property. However, degradation process depends on greatly the PH value of resinous wetability, solution or activator, and how to raise monomer to reclaim rate (whether can achieve ~100%) to remain a challenge. Pass dynamic reaction when colophony of hot solid sex when closed circuit reclaims, reclaim ideally rate for 100%; but reclaim must undertake below high temperature, reclaim resinous function can compare colophony of original hot solid sex to differ necessarily. Recently, Group of Ma Songqi of place of stuff of peaceful wave of Chinese Academy of Sciences, Zhu Jin's researcherBe in "Green Chemistry" the problem was published to be “ on periodicalClosed-loop Chemical Recycling Of Thermosetting Polymers And Their Applications: A Review”overview article
This overview originallies to heat sexual resinous closed circuit reclaims reach its to applied a domain to undertake overview and focusing. Closed circuit of resinous of hot solid sex reclaims cent is two kinds (graph 1) : (I) falls in specific requirement (acidity, alkalescent or activator solution) , hydrolyze of colophony of hot solid sex becomes monomer or valuable oligomer, can repeat use at preparation to heat up solid sex material or its function material. (The colophony of hot solid sex that Ii) contains dynamic key can carry as young as reactivity member (or solvent) exchange reacts and degradation. Below high temperature, as the volatilization of reactivity dissolvent, degradation child will produce commutative reaction, form cross-linking network afresh.
Should sum up dynamic to every kinds key, the key that be like ester, shrink aldehyde, Xi Fu key of alkaline, 2 sulfur, 6 hydrogen key of ester of 3 Qin structure, boric acid but splitting decomposition key or structural key, research progress undertook sum up and discussion, elaborated closed circuit of resinous of hot solid sex to reclaim mechanism. In addition, still summed up absorption method of closed circuit of resinous of hot solid sex to be in composite material (graph 2) , the 3D material that print and electron enclose the application in material. Hind, still developed a trend to undertake to the future of this domain conclusion and emphasize.
