Robust, sustainable cellulose composite aerogels with outstanding flame retardancy and thermal insulation. (15th February 2020)

• Record Type: Journal Article
• Authors: Luo, Xiaolei; Shen, Junyan; Ma, Yanan; Liu, Lin; Meng, Ranju; Yao, Juming
• Is Part Of: Carbohydrate polymers. Volume 230(2020)
• Publication Date: 2020-02-15
• Subjects: LDH layered double hydroxide -- MgAl-LDH layered double hydroxide prepared with Mg2+ and Al3+ -- MA-C MgAl-LDH with intercalated anion of CO32- -- MA-P MgAl-LDH with intercalated anion of H2PO4- -- CA neat cellulose aerogels -- CAC cellulose composite aerogels combining with MA-C -- CAP cellulose composite aerogels combining with MA-P -- MBA N, N-methylenebisacrylamide -- MgAl-LDO oxidation of MgAl-LDH under calcination -- HRR heat release rate -- PHRR peak value of HRR cruve -- THR total heat release -- PTHR peak value of THR cruve -- EHC effective heat of combustion -- PEHC peak value of EHC cruve -- SPR smoke production ratio -- PSPR peak value of SPR cruve -- MLR mass loss rate -- FPI fire performance index -- FGI fire growth index; Cellulose aerogel -- Layered double hydroxide -- Flame retardancy -- Smoke suppression; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2019.115623
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Cellulose aerogels were prepared by incorporating LDH as green nanofiller. A novel strategy to exfoliate LDH into nanosheets. The cellulose aerogels exhibited dramatically increased mechanical properties. Outstanding flame retardancy and smoke suppression performance were achieved Enhancement mechanisms of mechanical and flame retardant were well investigated. Abstract: Robust and sustainable cellulose composite aerogels were prepared by incorporating MgAl-layered double hydroxide (MgAl-LDH) as green nanofillers and flame retardants. Two series of aerogels combining MgAl-CO3 LDH (MA-C) and MgAl-H2 PO4 LDH (MA-P) were achieved, in which both MA-C and MA-P were uniformly dispersed in cellulose substances. The cellulose composite aerogels with 1.8 wt% of MA-C (denoted as CAC) and MA-P (denoted as CAP) displayed excellent mechanical properties, increased by 2.6 and 2.8 times compared with neat cellulose aerogels (CA), respectively. The peak of heat release rate (PHRR) of CAC and CAP reduced by 41 % and 50 % compared with the neat one, respectively, demonstrating the outstanding flame retardancy. The reduction in smoke production ratio (SPR) was 79 % for CAC and 75 % for CAP, respectively, indicating enhanced smoke suppression performance. Therefore, the high performance flame-retardant cellulose composite aerogels exhibit an application prospect in green advanced engineering field.