Synthesis and Properties of pH-, Thermo-, and Salt-Sensitive Modified Poly(aspartic acid)/Poly(vinyl alcohol) IPN Hydrogel and Its Drug Controlled Release

Table 1

Relationship between the ionic strength and swelling ratio.

Solution	Ionic strength (mmol/kg)	Swelling ratio (g⋅g^−1)
		IPN	Semi-IPN; KPAsp/PVA
10 mmol/L NaCl solution	10	152.66	116.73
10 mmol/L CaCl2 solution	30	99.35	80.03
10 mmol/L FeCl3 solution	60	68.94	52.14