Table 2.

Mechanical properties and degradation rates of degradable PUs from the literature compared with the CTC-PU(BET) synthesized in this study.

Formula of PU	Modulus (MPa)	Strength (MPa)	Elongation at Break (%)	Degradation Properties	Ref.
S=PCL; H=MDI; E=BD or MIDE	n/a	41–64	756–780	65% Mw reduction after in PBS after 30 days at 77 °C	21
S=Sulfobetaine-diol; H=HDI; E=DB	22–265	21–48	85–1001	2–90% weight loss in lipase PBS after 35 days at 37 °C	66
S= PCL-PEG-PCL; H=HDI; E=DB	5–75	8–20	325–560%	10–20% weight loss in PBS after 56 days	33
S=PCL; H=HDI or LDI; E=diester-diphenol	5–56	1–7	7–1006	n/a	49
S=PCL+ N-Boc-serinol; H=BDI; E=BD	13–140	25–38	246–823	1–20% weight loss in PBS after 16 weeks at 37 °C	24
S=PCL+DTT;H=LDI or BDI; E=BD	2.9–18.4	38–45	680–830	3–8% weight loss in PBS after 16 weeks at 37 °C	67
S= PCL; H= HDI; E= CaM	16	4.3	500	24% weight loss in PBS after 180 days at 37 °C	40
S=PGS+AP;C=HDI	1.5–75.5	1–5.3	17–104	5–86% weight loss in lipase PBS after 50 hours at 37 °C	11
S=PHB+PCL-PEG; H=TMDI	>20	~8	400%	50% Mw reduction in PBS after 346 days at 37 °C	30
S=star-shaped PCL polyols; C=HDI	62–1876	4.5–39.1	2.1–10	1.5–2.5% weight loss in sea water after 60 days	68
S=PCTC; H=HDI; E=BET	2.2	1.30	710	2.3% weight loss in PBS after 10 weeks at 37 °C	This work

S=soft segment; H=hard segment; E=chain extender; C=crosslinker

MIDE= 2,2-(methylimino)diethanol; MDI= Methylene diphenyl diisocyanate; DB= butanediamine; AP= aniline pentamer; PHB= poly(hydroxybutyrate); TMDI=2,2,4-trimethyl hexamethylene diisocyanate; LDI= L-Lysine ethyl ester diisocyanate; BDI=1,4-diisocyanatobutane; DTT= DL-dithiothreitol; calcium salt of p-aminobenzoic acid (CaM)