Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China.
Carbohydr Polym. 2014 Jan 30;101:83-8. doi: 10.1016/j.carbpol.2013.08.091. Epub 2013 Sep 14.
A novel carboxymethyl cellulose (CMC)-modified melamine-formaldehyde (MF) phase change capsule with excellent encapsulation was prepared by in situ polymerization. Effects of CMC on the properties of the capsules were studied by Fourier transformation infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electronic microscopy (SEM), X-ray diffractometry (XRD), and thermogravimetric analysis (TGA). The results showed that the CMC-modified capsules had an average diameter of about 50nm and good uniformity. The phase change enthalpy of the capsules was increased and the cracking ratio decreased by incorporating a suitable amount of CMC. The optimum phase change enthalpy of the nanocapsules was 83.46J/g, and their paraffin content was 63.1%. The heat resistance of the capsule shells decreased after CMC modification. In addition, the nanocapsule cracking ratio of the nanocapsules was 11.0%, which is highly attractive for their application as nano phase change materials.
采用原位聚合法制备了一种具有优异包封性能的新型羧甲基纤维素（CMC）改性三聚氰胺-甲醛（MF）相变胶囊。通过傅里叶变换红外光谱（FTIR）、差示扫描量热法（DSC）、扫描电子显微镜（SEM）、X 射线衍射仪（XRD）和热重分析（TGA）研究了 CMC 对胶囊性能的影响。结果表明，CMC 改性胶囊的平均粒径约为 50nm，具有良好的均匀性。通过加入适量的 CMC，胶囊的相变焓增加，开裂率降低。纳米胶囊的最佳相变焓为 83.46J/g，其石蜡含量为 63.1%。CMC 改性后胶囊壳的耐热性降低。此外，纳米胶囊的纳米胶囊开裂率为 11.0%，这对于它们作为纳米相变材料的应用具有很大的吸引力。
