. 2021 Feb 9;21(4):1591–1598. doi: 10.1021/acs.nanolett.0c03756

Table 2. T₁ Relaxation Time of Protons from −CH₂–CH₂– Units in the PEG Main Chain and −CH₃ End Groups for PEG2k and OVA-PEG Samples with Various Molecular Weights and Surface Grafting Densities^a.

entry	T₁ (−CH₂–CH₂−) [s]	SD (×10^–3)	T₁ (−CH₃) [s]	SD (×10^–2)	φ (−CH₂CH₂–/–CH₃)
PEG2k	1.30	1.62	2.61	1.54	62
OVA-PEG2k_0.2	1.41	1.24	3.91	1.31	91
OVA-PEG2k_0.5	1.37	1.33	3.03	2.52	78
OVA-PEG2k_2.5	1.33	1.79	2.82	1.82	43
OVA-PEG3.4k_0.2	1.42	1.61	3.61	2.44	76
OVA-PEG3.4k_0.8	1.34	1.17	3.42	1.29	65
OVA-PEG5k_0.2	1.46	2.35	3.79	1.93	196

φ represents the ratio of integrals of signals corresponding to −CH₂–CH₂– and −CH₃ end groups determined by ¹H NMR spectroscopy.

Table 2. T1 Relaxation Time of Protons from −CH2–CH2– Units in the PEG Main Chain and −CH3 End Groups for PEG2k and OVA-PEG Samples with Various Molecular Weights and Surface Grafting Densitiesa.