Journal of Polymer Research

, 25:195 | Cite as

Properties of polyamide 612/poly(vinyl alcohol) blends and their impact on free volume and oxygen barrier properties

  • Hong-bo Li
  • Jia-wei Wu
  • Ya-qiong Huang
  • James Runt
  • C. M. Huang
  • K. S. Huang
  • Jen-taut YehEmail author


Oxygen transmission rates and free volume properties (i.e. average volumes of free-volume-cavities (Vf), mean number of the free volume cavities per unit volume (I3) and fractional free volume (Fv)) values of bio-based polyamide 612 (PA612)/poly(vinyl alcohol) (PVA) (i.e. PA612xPVA03y, PA612xPVA05y, PA612xPVA08y and PA612xPVA14y) blend films were reduced to a minimum value, when their PVA content reached corresponding optimal values of 25, 20, 15 and 10 wt%, respectively. The minimum oxygen transmission rate, Vf, I3 and Fv value obtained for the best PA61290PVA1410, PA61285PVA0815, PA61280PVA0520 and PA61275PVA0325 bio-based blown films reduced considerably with decreasing PVA degrees of polymerization. As evidenced by the results of dynamical mechanical analysis, differential scanning calorimetry, wide angle X-ray diffraction and Fourier transform infrared spectroscopic experiments, PA612 and PVA are miscible to some extent at the molecular level when their PVA contents are ≤ the corresponding optimal values. The significantly improved oxygen barrier and free volume properties for the PA612xPVAzy blend films with optimized compositions is at least in part to the enhanced intermolecular interactions between PA612 carbonyl groups and PVA hydroxyl groups.


Bio-based, polyamide 612 Poly(vinyl alcohol) Oxygen barrier Free volume Miscibility 



The authors would like to express their appreciation to Ministry of Science and Technology, Taiwan (MOST104-2221-E-168 -018 -MY3) for support of this work. JR would like to thank the NSF Polymers Program for support through DMR-1505953.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry of Education, Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and EngineeringHubei UniversityWuhanChina
  2. 2.Department of Materials Science and EngineeringPenn State UniversityUniversity ParkUSA
  3. 3.Department of Materials EngineeringKun Shan UniversityTainanTaiwan

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