Study on the preparation and mechanical properties of PBAT matrix composite reinforced by cotton ribbed fabric

In order to improve the tensile modulus of polybutylene adipate-co-terephthalate(PBAT) composite material under small strain so as to load or cover heavy objects, the paper uses polylactic acid(PLA)-PBAT shape memory composite film filled with 10wt.% CaCO₃ as prefabricated body and homemade cotton ribbed fabric as skeleton material. CaCO₃/PLA-PBAT composites reinforced by single side (S series) and double side (D series) cotton ribbed fabric were prepared by blowing film and hot pressing process. The effects of preform and cotton ribbed fabric on the tensile property, bursting strength, tear resistance, shape memory, friction resistance and wetting properties of the composites were investigated. The results show that the S-series composites exhibit the mechanical properties of knitted fabric when the mass content of prefabricated body is low, and the stress curve is wavy with the increase of strain. When the mass content of the precast is higher, the modulus of the composite increases significantly, reaching 1048.7±49.9MPa. The longitudinal and transverse tear strength of S series and D series composites increases with the increase of resin content in the preform. The average longitudinal shape memory fixation rate(R_f) of D series composites is greater than 60%, and the maximum shape memory recovery rate(R_r) is 91.90%±1.56% at 120℃. In addition, the preform content has little influence on the longitudinal R_r, but with the increase of the preform content, the longitudinal R_r increases slightly. This paper provides a theoretical reference for the design and preparation of high modulus PBAT-based shape memory composites, and expands a new perspective for its application and research in the field of high performance heat shrink films.