Preparation of Cellulose/PVA/DBAD Films with Controllable Permeability and Their Preservation Effects on Strawberries

JIANG Yunfei; PAN Liao; WANG Jun; LU Lixin; DU Yuhang; CHEN Xi

doi:10.19554/j.cnki.1001-3563.2026.13.015

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (13) : 131-142. DOI: 10.19554/j.cnki.1001-3563.2026.13.015

Special Topic on Applications of High-Performance Fibers and Their Composites in Protection and Packaging

Preparation of Cellulose/PVA/DBAD Films with Controllable Permeability and Their Preservation Effects on Strawberries

JIANG Yunfei¹, PAN Liao^1,2*, WANG Jun^1,2, LU Lixin^1,2, DU Yuhang^1,2, CHEN Xi³

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Abstract

The work aims to prepare a packaging film with adjustable permeability to address the limitation of existing modified atmosphere packaging (MAP) materials for fruits and vegetables, whose gas permeability is fixed after film fabrication and cannot be subsequently adjusted. Pre-perforated cellulose matrix films were utilized, and their circular holes were locally filled with polyvinyl alcohol (PVA)/di-tert-butyl azodicarboxylate (DBAD) solutions containing varying DBAD concentrations (0.5%-4%) to fabricate composite films. The micro-morphology of the thermally induced pore regions and the oxygen transmission rate (OTR) of the films were systematically characterized. Based on the respiration intensity of strawberries, the theoretical optimal heating time was determined, and composite films treated with different heating times, along with low-density polyethylene (LDPE) films, were applied in a 12-day strawberry preservation trial. This trial comprehensively evaluated the controlled-permeability preservation effects across multiple dimensions, including physiological metabolism, physical and chemical indicators, and sensory qualities. Experimental results showed that micron-sized pores were successfully formed in the composite films after thermal treatment and the OTR of the thermally induced region spanned from 12.5 to 42 563.1 cm³/(m²·24 h·atm). Notably, the composite film with 3% DBAD content heated for 6 min rapidly established a gas environment of 6.3% O₂ and 9.2% CO₂, which precisely matched the preservation requirements of strawberries. This film group effectively inhibited changes in the weight loss rate, color, firmness, and decay index, thereby achieving the highest sensory scores and extending the ultimate shelf life of the strawberries from 6 days in the LDPE group to 12 days. A cellulose/PVA/DBAD film with controlled permeability is successfully prepared and the excellent controlled permeability of the prepared cellulose/PVA/DBAD film is successfully validated, demonstrating that an order-of-magnitude control over film permeability can be achieved by adjusting the DBAD content and heat treatment time. Ultimately, this microporous film exhibits significant application potential in modified atmosphere packaging for fruits and vegetables, as well as other fields involving controlled gas exchange.

Key words

controllable permeability / cellulose / di-tert-butyl azodicarboxylate (DBAD) / strawberry preservation

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JIANG Yunfei, PAN Liao, WANG Jun, LU Lixin, DU Yuhang, CHEN Xi. Preparation of Cellulose/PVA/DBAD Films with Controllable Permeability and Their Preservation Effects on Strawberries[J]. Packaging Engineering. 2026, 47(13): 131-142 https://doi.org/10.19554/j.cnki.1001-3563.2026.13.015

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