Biodegradable Poly(vinyl alcohol) Foams Supported by Cellulose Nanofibrils: Processing, Structure, and Properties
Biodegradable Poly(vinyl alcohol) Foams Supported by Cellulose Nanofibrils: Processing, Structure, and Properties
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纤维素纳米原纤维支持的可生物降解聚（乙烯醇）泡沫：加工、结构和性能
DOI：
10.1021/la502723d
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发表时间：
2014-08-12
期刊：
影响因子：
3.9
通讯作者：
Gu, Mingyue
中科院分区：
文献类型：
--
作者：
Liu, Dagang;Ma, Zhongshi;Gu, Mingyue
为了节约能源和实现环保目标，采用单向冷冻干燥技术制备了纤维素纳米纤丝（CNF）支撑的聚乙烯醇（PVA）可生物降解复合泡沫。通过扫描电镜（SEM）、压缩试验、X射线衍射（XRD）分析、吸水率和生物降解试验，研究了CNF含量、前驱体悬浮液固含量和淬火温度对复合泡沫材料微观结构和性能的影响。结果表明，CNF的掺入，优选在30重量%的重量比，大大提高了机械强度和模量，能量吸收，耐水性，和尺寸稳定性的复合泡沫，因为刚性和半结晶性质的CNF以及规则和紧凑的孔结构。此外，在模拟好氧堆肥环境中进行的生物降解试验表明，CNF的参与显着加快了复合泡沫的生物降解的步伐。因此，我们提供了一些有意义的信息，仿生多孔复合泡沫材料的形态和性能可控，通过改变冷冻干燥工艺和组成。
In order to capture savings in energy and ambitious environmental targets, biodegradable composite foams of poly(vinyl alcohol) (PVA) supported by cellulose nanofibrils (CNF) were prepared through unidirectional freeze-drying technology. Effects of the content of CNF, the solid content of the precursor suspension, and the quenching temperature on the microstructure and properties of the composite foams were investigated by scanning electron microscopy (SEM), compressive testing, X-ray diffraction (XRD) analysis, water uptake, and biodegradation tests. Results show that the incorporation of CNF preferably at a weight ratio of 30 wt % greatly enhanced the mechanical strength and modulus, energy absorption, water resistance, and dimensional stability of the composite foams because of the rigid and semicrystalline nature of CNF as well as regular and compact pore structures. Furthermore, the biodegradation tests performed in a simulated aerobic compost environment suggested that the involvement of CNF significantly accelerated the pace of biodegradation of the composite foams. Hence, we provided some meaningful information on the biomimetic cellular composite foams with controllable morphs and properties by varying the freeze-drying process and composition.