Citation: Jie-fu Li, Shu-guang Yang. The Effect of Interchain Hydrogen Bond on the Mechanical Properties of Poly(acrylic acid)-Poly(ethylene oxide) Complex Films[J]. Acta Polymerica Sinica, ;2019, 50(8): 857-862. doi: 10.11777/j.issn1000-3304.2019.19032 shu

The Effect of Interchain Hydrogen Bond on the Mechanical Properties of Poly(acrylic acid)-Poly(ethylene oxide) Complex Films

Jie-fu Li ,
Shu-guang Yang ^,

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620

Corresponding author: Shu-guang Yang, shgyang@dhu.edu.cn
Received Date: 11 February 2019
Revised Date: 4 March 2019
Available Online: 10 April 2019

Poly(acrylic acid) (PAA) and poly(ethylene oxide) (PEO) can form hydrogen-bonded polymer complex. A PAA/PEO homogenous solution can be obtained by adding NaOH into the mixture to restrict the hydrogen bonding between PAA and PEO. First, PAA was dissolved in 20 mL of NaOH aqueous solution and PEO was dissolved in 20 mL of distilled water with the total mass of PAA and PEO of 3.48 g. After stirred for 6 h and centrifuged in the deaeration system at 3500 r/min for 10 min, the mixture was blade coated onto a PTFE plate through an adjustable film applicator with the thickness of 2 mm, and dried in the ambient environment to obtain PAA/PEO films. The effects of film composition and acid treatment on the structures and mechanical properties of the films were studied by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), wide angle X-ray diffraction (XRD), and mechanical streching machine. The crystallization behavior of PEO and the mechanical properties of the films showed strong dependence on the hydrogen bonding between PAA and PEO. The elongation increased while the tensile strenghth and the Young’s modulus decreased first and then increased with the increasing PEO content in the films. After incubation in a pH = 1 solution for 3 min, the hydrogen bonding between PAA and PEO was enhanced. Compared with the film without acid treatment, the flexibility of the film was greatly enhanced after acid incubation. In particular, Young’s modulus of the film (n(AA):n(EO) = 1:3) before acid treatment was 426 MPa while it declined to 3 MPa after acid incubation. Namely, when the hydrogen bonding between PAA and PEO became weak, PEO would crystallize and the film performed like a plastic material. When the hydrogen bonding between PAA and PEO became strong, the crystallization of PEO was restricted and the film acted as a rubber material.
- High elasticity,
- Hydrogen bond,
- Polymer complex
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