高透光性全生物质基薄膜的制备与表征
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摘要
以瓜尔胶和纳米微晶纤维素为原料,使用戊二醛交联和流延法制备了全生物质基复合薄膜;利用红外光谱仪、X射线衍射仪、紫外可见光谱仪和扫描电子显微镜等仪器分别对薄膜表面基团、结晶结构、透光度和表面形貌进行表征;通过拉伸强度和溶胀性能的研究,评估了戊二醛用量对薄膜机械性能和吸湿性能的影响。结果表明,瓜尔胶薄膜经戊二醛交联后,表面变得平整;随着戊二醛用量的增加,薄膜的透光率提高,当戊二醛用量为0.8%时,薄膜透光度可达到未交联薄膜的143%,拉伸强度是未交联薄膜的4.6倍。采用戊二醛进行交联后制得的薄膜在绿色包装中具有应用潜力。
The membrane with guar gum and nanocrystalline cellulose as raw material was prepared by casting after cross-linking with glutaraldehyte. Fourier transform infrared(FT-IR), X ray diffraction(XRD), ultraviolet spectrum, scan electronic microscope(SEM) were used to study the surface groups, crystal properties, transmittance, and morphology of the membrane. The effect of glutaraldehyte dosage on the mechanical property and moisture absorption of membrane was also studied. The surface of membrane became smooth after cross-linking with glutaraldehyte. When the dosage of glutaraldehyte was 0.8%, the transmittance of membrane increased to 143% of uncrosslinked membrane, and the tensile strength was 4.6 times of uncrosslinked membrane. The film crosslinked with glutaraldehyde showed application potential in green packaging.
The membrane with guar gum and nanocrystalline cellulose as raw material was prepared by casting after cross-linking with glutaraldehyte. Fourier transform infrared(FT-IR), X ray diffraction(XRD), ultraviolet spectrum, scan electronic microscope(SEM) were used to study the surface groups, crystal properties, transmittance, and morphology of the membrane. The effect of glutaraldehyte dosage on the mechanical property and moisture absorption of membrane was also studied. The surface of membrane became smooth after cross-linking with glutaraldehyte. When the dosage of glutaraldehyte was 0.8%, the transmittance of membrane increased to 143% of uncrosslinked membrane, and the tensile strength was 4.6 times of uncrosslinked membrane. The film crosslinked with glutaraldehyde showed application potential in green packaging.
引文
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[5] Zhang Y,Zhao Q,Wang H,et al.Preparation of green and gelatin-free nanocrystalline cellulose capsules[J].Carbohydrate Polymers,2017,164:358.
[6] Long K,Cha R,Zhang Y,et al.Cellulose nanocrystals as reinforcements for collagen-based casings with low gas transmission[J].Cellulose,2017,25(85):1.
[7] Khan A,Khan R A,Salmieri S,et al.Mechanical and barrier pro-perties of nanocrystalline cellulose reinforced chitosan based nanocomposite films[J].Carbohydrate Polymers,2012,90(4):1601.
[8] He Y.Study on poly(lactic acid)/nanocrystalline cellulose biodegradable food packaging films and the application of broccoli preservation[D].Hangzhou:Zhejiang University,2018.何依谣.聚乳酸/纳米纤维素可降解食品包装薄膜的研究及其在西兰花保鲜中的应用[D].杭州:浙江大学,2018.
[9] Luo W,Wang Z,Yuan C,et al.Preparation and properties of cellulose nanocrystal/poly(lactic acid) composites[J].Polymer Materials Science and Engineering,2014,30(9):154.罗卫华,王正良,袁彩霞,等.纤维素纳米晶/聚乳酸复合材料的制备与性能[J].高分子材料科学与工程,2014,30(9):154.
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[12] Wang Q,Zhao X,Zhu J.Kinetics of strong acid hydrolysis of a bleached kraft pulp for producing cellulose nanocrystals(CNCs)[J].Industrial & Engineering Chemistry Research,2014,53(27):11007.