Effect of Blending Modification on Structure and Mechanical Properties of PBAT/Thermoplastic Corn Starch Composites

doi:10.19491/j.issn.1001-9278.2020.09.006

Abstract

Abstract:

As a biodegradable thermoplastic, PBAT has some application limitations due to its high price. In this study, the low?cost corn starch was used as a filler to modify PBAT. The corn starch was first plasticized with glycerol and then extruded with a twin-screw extruder to obtain the thermoplastic corn (TPS) granules. PBAT/TPS composites were prepared at different ratios by melt blending, and the effect of TPS content on their structure and mechanical property was investigated. The results indicated that there were a large number of hydroxyl groups formed in the starch after plasticized with glycerol. PBAT exhibited the same crystalline structure with PBT. In the PBAT/TPS composites, the PBAT domain showed a gradual decrease in the level of crystallization perfection with an increase of TPS content, and meanwhile its crystallization temperature shifted to a high temperature. As the TPS content increased, the tensile strength and elongation at break of the composites decreased gradually but their elastic modulus tended to increase

Key words: corn starch, poly(adipic acid)/butylene terephthalate, compatibility, mechanical property

CLC Number:

TQ323.4⁺1

TIAN Yincai, DONG Anwang. Effect of Blending Modification on Structure and Mechanical Properties of PBAT/Thermoplastic Corn Starch Composites[J]. China Plastics, 2020, 34(9): 33-37.

Figures/Tables 5

Fig.1. FTIR spectra of different samlpes

Fig. 2. XRD patterns of PBAT/TPS with different ratio of TPS and PBAT

Fig.3. DSC curves of PBAT/TPS with different content of TPS

Fig.4. Fracture morphology of PBAT/TPS with different content of TPS

TPS含量/%	弹性模量/MPa	拉伸强度/MPa	断裂伸长率/%
0	135.73±0.83	34.55±0.69	598±35
10	141.48±0.78	29.97±0.84	589±26
20	150.82±1.65	27.88±0.77	484±30
30	161.43±0.70	25.81±0.79	465±29
40	184.52±1.36	23.11±0.62	381±64
50	220.67±0.24	21.30±0.75	180±60

Tab.1. Mechanical properties of PBAT/TPS with different content of TPS

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