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Surface Hydrophobic Modification of Microcrystalline Cellulose by Poly(methylhydro)siloxane Using Response Surface
Yulin Xie1, Siquan Cai2, Zhen Hou3
1College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China. Xieyulin1217@163.com.
Polymers
|April 10, 2019
Summary
Surface modification of microcrystalline cellulose (MCC) using poly(methylhydro)siloxane) (PMHS) significantly enhances its hydrophobicity. Optimized conditions yielded a water contact angle of 141.5°, confirming effective surface property improvement.
Area of Science:
- Materials Science
- Polymer Chemistry
- Surface Chemistry
Background:
- Microcrystalline cellulose (MCC) is a widely used biopolymer with limitations in hydrophobicity for certain applications.
- Surface modification is a key strategy to impart desired properties to cellulosic materials.
- Developing efficient and controllable methods for MCC surface functionalization is crucial for advanced material development.
Purpose of the Study:
- To optimize the surface modification of microcrystalline cellulose (MCC) using poly(methylhydro)siloxane (PMHS).
- To investigate the effects of reaction conditions on the hydrophobicity of modified MCC.
- To confirm the successful attachment of PMHS to MCC and evaluate the resulting surface properties.
Main Methods:
- Surface modification of MCC using poly(methylhydro)siloxane (PMHS) as a modifier and n-hexane as a solvent.
- Optimization of reaction conditions (PMHS concentration, reaction time, drying temperature) using response surface methodology (RSM).
- Characterization of surface chemical properties using X-ray photoelectron spectroscopy (XPS) and measurement of water contact angle.
Main Results:
- Optimal reaction conditions determined: 0.0275% PMHS concentration, 20 min reaction time, and 70 °C drying temperature.
- Modified MCC achieved a water contact angle of 141.5°, indicating significantly enhanced hydrophobicity.
- X-ray photoelectron spectroscopy confirmed the successful grafting of PMHS chains onto the MCC surface, evidenced by the presence of methyl groups.
Conclusions:
- The surface modification of MCC with PMHS is an effective method to significantly improve its hydrophobicity.
- Response surface methodology provides a reliable tool for optimizing reaction conditions and predicting outcomes for MCC modification.
- The enhanced hydrophobic properties of modified MCC open possibilities for its use in water-repellent materials and composites.
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