Table 1 Structural and mechanical parameters of various injectable formulations.

Crosslink chemistry^a	Ratio^b	\({n}_{{sc}}\)^c	\({n}_{{bb}}\)^d	\({n}_{x}\)^e	E (kPa)^f	β^g	\({E}_{0}\) (kPa)^h	\({\lambda }_{{\max }}^{{\exp }}\)ⁱ	\({\lambda }_{{\max }}^{{calc}}\) ^j
Dual component permanent injectable elastomers
NCO:OH	1:1	14	889	50	18.6	0.24	27.8	2.1	2.0
NCO:OH	1:2	14	889	100	11.1	0.12	13.5	2.7	2.9
NCO:OH	1:4	14	889	200	4.2	0.10	5.1	3.2	3.2
NCO:OH	1:8	14	889	400	2.1	0.08	2.3	3.6	3.5
NCO:OH	1:1	70	304	50	3.0	0.31	5.3	1.9	1.8
NCO:OH	1:2	70	304	100	1.3	0.26	2.1	2.2	2.0
Injectable elastomers with dynamic crosslinks
F:M	1:1	14	889	50	15.3	0.23	22.3	2.1	2.1
F:M	2:1	14	889	100	6.3	0.14	7.8	2.7	2.6
F:M	4:1	14	889	200	1.5	0.12	1.8	2.9	2.8
Single component photocurable injectable elastomers
PCMA	1.5	14	889	100	4.8	0.06	5.2	4.2	4.1
PCMA	3	14	889	200	1.7	0.05	1.8	4.9	4.5

^aChemistry used for injectable elastomers with isocyanate (NCO) coupled with hydroxyl (OH) or amine (NH₂) (Figs. 1 –3) furan (F) coupled with maleimide (M) (Supplementary Fig. 10) and photocurable methacrylate (PCMA) (Supplementary Fig. 11) side chain ends.
^bRespectively ratios of each moiety in the chemistry couple. For PCMA, the ratio represents the controlled fraction percent of side chains with the photocurable moiety (i.e., 1.5 and 3 mol%).
^cDegrees of polymerization (DP) of side-chains.
^dBackbone of random polydimethylsiloxane-poly(ethylene glycol) (PDMS-r-PEG) bottlebrush macromolecules prior to crosslinking determined by ¹H-NMR.
^eNominal DP of the backbone strand between cross-links.
^fStructural Young’s modulus (E).
^gStrain-stiffening parameter (\(\beta\)) obtained by fitting stress-strain curves with Eq. (1).
^hYoung’s modulus (Eq. 2).
ⁱExperimental elongation at break.
^jTheoretical elongation at break as \({\lambda }_{{\max },{theo}}={\beta }^{-0.5}\).

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