China Plastics ›› 2024, Vol. 38 ›› Issue (1): 14-20.DOI: 10.19491/j.issn.1001-9278.2024.01.003

• Materials and Properties • Previous Articles     Next Articles

Effect of poly(vinyl acetate) (PVAc) on physicochemical properties of PHB/PCL blends

CHEN Cheng(), ZHANG Hao, YANG Mengyao, CHEN Haiying(), SUN Hao, WEI Lingjun   

  1. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China
  • Received:2023-07-23 Online:2024-01-26 Published:2024-01-22

Abstract:

Poly(vinyl acetate) (PVAc) as a non⁃covalent compatibilizer was incorporated into a polyhydroxybutyrate (PHB)/polycaprolactone (PCL) binary blending system at a mass ratio of 25/75, and its film was prepared through solution casting. The effect of addition amounts of PVAc on the mechanical properties and physicochemical properties of the blend system was investigated. Tensile experimental results indicated that the elongation at break and tensile strength of the PHB/PCL film containing 1 wt% PVAc were 2.50 and 1.19 times higher than those of the counterpart film without PVAc, respectively. FTIR spectra showed that there was an intermolecular hydrogen bonding interaction between the carbonyl and methyl groups of PHB and PCL due to a bridging action of PVAc. This results in a shift of carbonyl absorption band along with a decrease in the peak intensity. SEM showed that the addition of PVAc reduced the size of dispersed phase in the blend system, promoting a more uniform distribution. As a result, and the compatibility of the blend system was improved.

Key words: polyhydroxybutyrate, polycaprolactone, poly(vinyl acetate), compatibilizer, blending

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