Table 4.

Injectable systems based on shape memory polymers

	Polymer	Mechanism of gelation	Cross-linker agent	Chemical factors	Biological factor	Year	Ref.
1	Poly(e-caprolactone)dimethacrylate (PCLDMA)	Photo-cross-linking				2009	Neuss et al. (2009)
2	Methacrylated alginate	Free-radical polymerization		Ammonium persulfate as initiator and tetramethylethylenediamine as catalyst		2012	Bencherif et al. (2012)
3	Poly(3-caprolactone) and poly(ethylene glycol)	Thiol–ene chemistry	tetrathiol	2,2-dimethoxy-2-phe- nylacetophenone as photoinitiator and NaCl for porogen leaching	TGF-b	2013	Baker et al. (2013)
4	Methacrylated gelatin	Free-radical polymerization		Ammonium persulfate as initiator and tetramethylethylenediamine as catalyst		2014	Koshy et al. (2014)
5	Poly(e-caprolactone) diacrylate coated with polydopamine	Photo-cross-linking		2,2-dimethoxy-2-phenyl acetophenone as photoinitiator		2014	Zhang et al. (2014)
6	Methacrylatedhyaluronic acid	Free-radical polymerization		Ammonium persulfate as initiator and tetramethylethylenediamine as catalyst		2017	Cheng et al. (2017)
7	Poly(octamethylene maleate (anhydride) citrate)	Photo-cross-linking		Irgacure 2959 as photoinitiator and poly(ethylene glycol) dimethyl ether		2017	Montgomery et al. (2017)
8	Methacrylate gelatin	Free-radical polymerization		Ammonium persulfate as initiator and tetramethylethylenediamine as catalyst and cellulose nanocrystal	Betamethasone sodium phosphate	2020	Goodarzi et al. (2020)
9	Methacrylate gelatin	Free-radical polymerization	FeCl3	Ammonium persulfate as initiator and tetramethylethylenediamine as catalyst and cellulose nanocrystal		2021	Jonidi Shariatzadeh et al. (2021)