. Author manuscript; available in PMC: 2015 Nov 23.

Published in final edited form as: Acta Biomater. 2014 Aug 14;10(11):4639–4649. doi: 10.1016/j.actbio.2014.08.008

Table 2.

Mechanical properties of PEUU-NH₂ and PEUU-PC under dry and wet conditions, and water absorption of dry films.

Polymer	Strain at break (%)		Tensile strength at break (MPa)		Initial modulus (MPa)		Water absorption (%)

	Dry	Wet	Dry	Wet	Dry	Wet
PEUU-N1	823 ± 27^a	693 ± 35^b	25.5 ± 6.7^a	29.8 ± 3.0^a	13.0 ± 2.7^a ^b	15.0 ± 1.6^a	2.6 ± 0.4^a
PEUU-PC1	735 ± 14^b	485 ± 35^c	38 ± 1.4^a	13.6 ± 1.1^b	15.2 ± 1.2^a	10.3 ± 0.5^b	17.3 ± 0.6^b
PEUU-N2	685 ± 20	—	30.4 ± 3.6	—	18.8 ± 2.8	—	4.6 ± 1.1
PEUU-N3	600 ± 24^a	530 ± 15^b	34.4 ± 1.8^b	28.1 ± 2.1^c	26.6 ± 2.6^a	17.3 ± 1.7^b	7.8 ± 1.0^a
PEUU-PC3	508 ± 26^b	421 ± 30^c	41 ± 3.0^a	15.0 ± 2.8^d	27 ± 3.1^a	10.7 ± 0.9^c	27.0 ± 1.5^b
PEUU-N5	370 ± 17^a	153 ± 40^b	29.6 ± 2.8^b	10.1 ± 2.3^c	49.0 ± 3.5^a	20.1 ± 2.6^b	8.8 ± 0.8^a
PEUU-PC5	370 ± 19^a	110 ± 23^b	38 ± 4.2^a	5.3 ± 0.5^c	43 ± 2.3^a	10.7 ± 0.9^c	38.4 ± 0.9^b
PEUU-N10	246 ± 27	—	35.4 ± 2.7	—	140.6 ± 12.3	—	12.2 ± 0.7

Statistical comparisons were made amongst each PEUU-NH₂ type with a corresponding PEUU-PC type under dry and wet conditions. a, b, c and d denote statistically distinct groups for each measured parameter, including dry & wet, within a given set of PEUU-NH₂ and corresponding PEUU-PC polymers.