Abstract
N,N‐Bis(2‐hydroxyethyl)formamide, N‐(2‐hydroxyethyl)formamide (HF), N‐(2‐hydroxyethyl)‐N‐methylformamide, and N‐(2‐hydroxypropyl)formamide were used as poly(vinyl alcohol) (PVA) plasticizers to prepare PVA films by casting method. The four synthesized compounds were hydroxyalkylformamides (HAF). Fourier‐transform infrared spectra demonstrated that hydrogen bond interaction between the new plasticizers HAF and PVA occurred. The crystallinity of PVA and PVA film was characterized by X‐ray diffraction. Differential scanning calorimetry showed that HAF could decrease the melting point (Tm) of PVA. For PVA films with the same weight content plasticizer, the lower the molecular mass of plasticizer was, the lower the Tm of PVA was. The Tm of HF‐plasticized PVA was lower than that of traditional glycerol‐plasticized PVA. Generally, water‐vapor resistance of HAF‐plasticized PVA film was better than that of glycerol‐plasticized PVA film. The mechanical properties of PVA films stored at different relative humidity were studied. HAF were effective plasticizers for PVA. POLYM. ENG. SCI., 58:E145–E150, 2018. © 2017 Society of Plastics Engineers
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