CAJ | 학술논문

利用超细研磨机仅一次性研磨的方法制得直径均匀分布在15 nm，长度达几微米的高长径比的纳米纤维素(CNF)，经过滤得CNF膜(CNF-I膜)，经碱液丝光处理制得CNF-II膜。用浸渍法与聚乙烯醇(PVAL)溶液复合，制得PVAL/CNF-I和PVAL/CNF-II复合膜。对CNF-I和CNF-II膜与PVAL/CNF复合膜的形貌特征、力学性能及热膨胀性进行了表征，研究丝光处理对CNF膜与PVAL/CNF复合膜性能的影响。场发射扫描电镜照片表明， CNF具有独特的互穿三维网状结构，且分布非常均匀；与PVAL复合后，两者界面相容性好，结合致密。拉伸试验分析说明PVAL/CNF-I复合膜的拉伸强度和拉伸弹性模量均大大提高，是纯PVAL膜的2倍左右；经丝光处理后， PVAL/CNF-II复合膜的断裂伸长率提高了一倍，表明其韧性比PVAL/CNF-I复合膜大大提高。静态热机械分析表明：PVAL/CNF-I复合膜的热膨胀系数(CTE)降低到20.5×10-6 K-1，与铝合金的CTE相近，尺寸稳定性大大提高，拓宽了其加工和应用领域。
이용초세연마궤부일차성연마적방법제득직경균균분포재15 nm，장도체궤미미적고장경비적납미섬유소(CNF)，경과려득CNF막(CNF-I막)，경감액사광처리제득CNF-II막。용침지법여취을희순(PVAL)용액복합，제득PVAL/CNF-I화PVAL/CNF-II복합막。대CNF-I화CNF-II막여PVAL/CNF복합막적형모특정、역학성능급열팽창성진행료표정，연구사광처리대CNF막여PVAL/CNF복합막성능적영향。장발사소묘전경조편표명， CNF구유독특적호천삼유망상결구，차분포비상균균；여PVAL복합후，량자계면상용성호，결합치밀。랍신시험분석설명PVAL/CNF-I복합막적랍신강도화랍신탄성모량균대대제고，시순PVAL막적2배좌우；경사광처리후， PVAL/CNF-II복합막적단렬신장솔제고료일배，표명기인성비PVAL/CNF-I복합막대대제고。정태열궤계분석표명：PVAL/CNF-I복합막적열팽창계수(CTE)강저도20.5×10-6 K-1，여려합금적CTE상근，척촌은정성대대제고，탁관료기가공화응용영역。
Cellulose nanofiber (CNF) having a uniform width of 15 nm and a length of several micrometers corresponding to a high aspect ratio was successfully obtained by using only one pass through the grinder treatment. CNF film (CNF-I film) was prepared by filtration,and CNF-II film was prepared by further mercerization. After making PVAL/CNF-I and PVAL/CNF-II composite film by impregnation with PVAL solution,the morphology feature,mechanical performance and thermal expansion property of CNF-I,CNF-II film and PVAL/CNF composite film were characterized. The impact of mercerization on properties of CNF film and PVAL/CNF composite film was studied. Field emission scanning electron microscopy observations show that obtained CNF has unique web-like entangled structure with a uniform distribution and is densely combined with PVAL,showing good interfacial bonding between CNF and PVAL. The tensile test explain that the tensile strength and Young’s modulus of PVAL/CNF-I composite film is greatly improved,which is about twice as high as pure PVAL film. After mercerization,the elongation at break of PVAL/CNF-II composite film is twice as high as that of PVAL/CNF-I composite film,showing higher toughness. Thermomechanical analysis reveal that the coefficient of thermal expansions (CTE) of PVAL/CNF-I composite film is decreased to 20.5 ×10-6 K-1,which is similar to the CTE of aluminum,corresponding to better dimensional stability,which could broaden its processing and applications field.