Thermoplastic starch composites reinforced synergistically with PLA fiber and PVA fiber

doi:10.19491/j.issn.1001-9278.2021.12.003

Abstract

Abstract:

To improve the mechanical and water resistance of thermoplastic starch （TPS） plastics， TPS based compo?sites reinforced with poly（lactic acid） fiber （PLAF） and poly（vinyl alcohol） fiber （PVAF） were prepared through extrusion molding. The effects of PVAF content on the mechanical properties， cross-section morphology， water resistance， and torque rheological properties of TPS/PVAF/PLAF composites were investigated. The results indicated that the mechanical properties and surface water resistance of the composites were improved effectively with the synchronous addition PLAF and PVAF. When the contents of PLAF and PVAF were 1 wt%， the tensile strength of the composites increased from 1.98 MPa to 10.53 MPa， the impact strength increased from 33.4 kJ/m² to 62.23 kJ/m²， and the balance torque of TPS/PVAF/PLAF compsite reached a maximum of 15.75 N·m.

Key words: poly（lactic acid） fiber, poly（vinyl alcohol） fiber, thermoplastic starch, composite, coordination, reinforcement

CLC Number:

TQ321.2

YIN Peng, MA Hongpeng, GUO Bin, LI Panxin. Thermoplastic starch composites reinforced synergistically with PLA fiber and PVA fiber[J]. China Plastics, 2021, 35(12): 16-20.

Figures/Tables 5

Fig.1. Mechanical properties of TPS/PLAF/PVAF with different PVAF content

Fig.2. SEM micrograph for the fractured surface of TPS/PLAF/PVAF filled with different PVAF contents

Fig.3. Water contact angle of TPS/PLAF/PVAF with different PVAF contents

Fig.4. Rheological curves of TPS/PLAF/PVAF composites with different PVAF contents

PVAF含量/%	初始扭矩/N·m	扭矩峰值/N·m	平衡扭矩/N·m
TPS	-7.19	31.22	8.57
0	-9.04	43.39	13.18
0.2	-11.34	58.61	12.24
0.4	-6.24	58.37	13.44
0.6	-0.15	48.32	14.13
0.8	-1.11	48.55	13.44
1.0	-8.35	61.18	15.75
1.2	15.70	53.22	12.25
1.4	-3.14	82.24	12.24

Tab.1. Rheological data of TPS/PLAF/PVAF composites with different PVAF contents

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