Table 1. New Alternating Dipeptoids Synthesized for This Study.^a.

polymer	Mn (g/mol)	LCST or UCST upon heating	LCST upon cooling
Poly-C3-Pr	2500	UCST = 60 °C	LCST = 20 °C
Poly iC4-Pr	3000	UCST = 50 °C	LCST = 10 °C
Poly-C4-Pr	2700	UCST = 50 °C	LCST = 10 °C
Poly-C5-Pr	2800	LCST = 30 °C	LCST = 20 °C

^aThe polymer sample (10.0 mg) was first dissolved in EtOH (100 μL) and then diluted with H₂O (1.9 mL). The UV–vis spectra of the sample aqueous solutions were collected at 10 °C intervals upon heating from 30 to 90 °C and upon cooling from 70 to 10 °C. The waiting time for each temperature was 5 min. LCST, lower critical solution temperature; UCST:, upper critical solution temperature.