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Facile Preparation of Chitosan-Based Composite Film with Good Mechanical Strength and Flame Retardancy
| Content Provider | MDPI |
|---|---|
| Author | ZeNan, Zhou Chen, Jirui Huang, Wentao Chen, Yifan Liu, Huan Zhang, Wenbiao Huang, Jingda |
| Copyright Year | 2022 |
| Description | To improve on the poor strength and flame retardancy of a chitosan (CS)-based functional film, cellulose nanofiber (CNF) was taken as the reinforced material and both ammonium polyphosphate (APP) and branched polyethyleneimine (BPEI) as the flame-retardant additives in the CS matrix to prepare the CS/CNF/APP/BPEI composite film by simple drying. The resulting composite film showed good mechanical strength, with a tensile strength reaching 71.84 Mpa due to the high flexibility of CNF and the combination of CS, CNF and BPEI through strong hydrogen bonding interactions. The flame retardant-performance of the composite film greatly enhanced the limit oxygen index (LOI), up to 32.7% from 27.6% for the pure film, and the PHRR intensity decreased to 28.87 W/g from 39.38% in the micro-scale combustion calorimetry (MCC) test due to the ability of BPEI to stimulate the decomposition of APP, releasing non-flammable gases such as $CO_{2}$, $N_{2}$, $NH_{3}$, etc., and forming a protective phosphating layer to block the entry of $O_{2}$. Based on the good flame retardancy, mechanical strength and transparency, the CS/CNF/APP/BPEI composite film has a great potential for future applications. |
| Starting Page | 1337 |
| e-ISSN | 20734360 |
| DOI | 10.3390/polym14071337 |
| Journal | Polymers |
| Issue Number | 7 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-03-25 |
| Access Restriction | Open |
| Subject Keyword | Polymers Chitosan Cellulose Nanofiber Flame Retardant Film Mechanical Strength |
| Content Type | Text |
| Resource Type | Article |
