摘要
将纤维素纳米晶(CNCs)混入纤维素溶液中,经过凝胶化再生制得具有疏水表面的高强度再生纤维素复合薄膜。扫描电镜表明CNCs与再生纤维素基体具有良好的相容性。X射线衍射研究发现CNCs的加入使复合薄膜纤维素I型晶含量提高。表面水接触角测试表明CNCs会提高复合薄膜表面亲水性,经过硅烷化改性之后复合薄膜表面呈疏水性,其水接触角约为105°。CNCs的加入使复合薄膜的拉伸强度达到92.0 MPa,相比于纯再生纤维素薄膜(62.7 MPa)提升了46.7%。弹性模量也从3466 MPa提高至6025 MPa,提升了约1.6倍。CNCs的加入能提高再生纤维素薄膜起始热降解温度和热降解峰值温度。
High strength regenerated cellulose composite films with hydrophobic surface were prepared after the gelation regeneration of mixture of cellulose nanocrystals and cellulose matrix.The structures of the composite films were studied by SEM.It is found that the CNCs have a good compatibility with the regenerated cellulose matrix.It is also found that the addition of CNCs increases the content of cellulose crystal of the composite films by XRD.The surface water contact angle test shows that the addition of CNCs enhances the surface hydrophilicity of the composite films.After silylation modification,the surface of the composite films is hydrophobic,and its water contact angle is about 105°.The addition of CNCs results in the tensile strength of regenerated cellulose films of 92.0 MPa,which is 46.7%higher than that of the pure regenerated cellulose film(62.7 MPa).Elastic modulus also increases from 3466 MPa to 6025 MPa,an increase of about 1.6 times.The thermally degrade beginning temperature and the maximum mass loss rate temperature are increased by adding CNCs.
作者
杨彪
李磊
周子涵
徐玲
钟淦基
李忠明
Biao Yang;Lei Li;Zihan Zhou;Ling Xu;Ganji Zhong;Zhongming Li(College of Polymer Science and Engineering,Sichuan University;State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第5期157-163,170,共8页
Polymer Materials Science & Engineering
基金
国家自然科学基金(51673135,51822305,51803140,21776186)
四川省杰出青年基金(2017JQ0017)
关键词
再生纤维素
纤维素纳米晶
薄膜
疏水
高强度
regenerated cellulose
cellulose nanocrystal
film
hydrophobicity
high strength
