Preparation and characterization of Enteromorpha prolifera nanocellulose/polyvinyl alcohol composite films,Polymer Composites

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Preparation and characterization of Enteromorpha prolifera nanocellulose/polyvinyl alcohol composite films
Polymer Composites ( IF 4.8 ) Pub Date : 2020-12-29 , DOI: 10.1002/pc.25926
Zhichao Zhang ₁ , Xin Liu ₁ , HuiXin Wang ₁ , HaiFeng He ₁ , Ruiqin Bai ₁

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Due to the frequent occurrence of Enteromorpha prolifera “green tide” in recent years, how to solve the ecological disaster brought by the green tide and make maximal use of the Enteromorpha prolifera have become an urgent problem. In order to realize the resource utilization of marine biomass, we extract nanofibrillated cellulose (NFC) with high aspect ratio from Enteromorpha prolifera. Filamentous NFC is successfully extracted at nanometric scale with a diameters range of 20 ~ 40 nm, a length of several microns, and a crystallinity index of 57.2%. Then NFC/polyvinyl alcohol (PVA) composite films were prepared with NFC as fillers. In addition, for comparison, nanocrystals cellulose (NCC) with small aspect ratio was isolated from microcrystalline cellulose (MCC) to prepare NCC/PVA composite films. It is shown that because Enteromorpha proliferata NFC has a higher aspect ratio, it is easier to interpenetrate with PVA to form a dense network, and the lower concentration ensures the better dispersion of NFC in the matrix, so its enhancement effect on PVA composite films is better than that of NCC. When the NFC content was 0.1 wt %, the light transmittance of NFC/PVA composite film could reach more than 94%, and the swelling degree was 250%, which is 29% lower than that of the pure PVA film, the water resistance was improved. At the same time, the tensile strength, elastic modulus and toughness were 99.1%, 1547% and 117.9% respectively, which are higher than those of PVA.

中文翻译：

morph肠纳米纤维素/聚乙烯醇复合膜的制备与表征

近年来，由于of小肠“绿潮”的频繁发生，如何解决绿潮带来的生态灾害，如何最大限度地利用pro小肠已成为迫在眉睫的问题。为了实现海洋生物质的资源利用，我们从Enter肠中提取了高长径比的纳米原纤化纤维素（NFC）。。已成功地以纳米级提取了丝状NFC，直径范围为20〜40 nm，长度为几微米，结晶度为57.2％。然后以NFC为填充剂制备了NFC /聚乙烯醇（PVA）复合膜。另外，为了进行比较，从微晶纤维素（MCC）中分离出长径比小的纳米晶纤维素（NCC），制备了NCC / PVA复合膜。结果表明，由于Enteromorpha proliferata NFC具有较高的长径比，更易于与PVA互穿以形成致密的网络，并且较低的浓度可确保NFC在基质中的分散性更好，因此其对PVA复合膜的增强作用优于NCC。当NFC含量为0.1wt％时，NFC / PVA复合膜的透光率可达到94％以上，溶胀度为250％，比纯PVA膜低29％，耐水性为改善。同时，抗张强度，弹性模量和韧性分别为99.1％，1547％和117.9％，高于PVA。

更新日期：2020-12-29

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