研究目的
Investigating the preparation and properties of polyamide 6/ZnO nanocomposites through an in situ co-producing method.
研究成果
The PA6/ZnO nanocomposites prepared by in situ polymerization exhibited enhanced tensile strength and uniform dispersion of nano-ZnO in the PA6 matrix. However, the crystallization rate and crystal size of nano-ZnO were reduced due to the hindering effect of PA6 molecular chains. The nanocomposites also showed improved friction and wear properties.
研究不足
The study notes that the nano-ZnO crystallization rate and crystal size in the PA6 matrix were hindered by the bulky PA6 molecular chains, indicating a limitation in the crystallization process due to the polymer matrix.
1：Experimental Design and Method Selection:
The study employed an in situ co-producing method where Zn2(OH)2CO3 decomposed into nano-ZnO during the opening-ring polymerization of caprolactam at high temperature.
2：Sample Selection and Data Sources:
Reagent grade ε-caprolactam, adipic acid, formic acid, and basic zinc carbonate (Zn2(OH)2CO3) were used.
3：List of Experimental Equipment and Materials:
Transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), universal tensile and impact testing instruments.
4：Experimental Procedures and Operational Workflow:
The mixture was heated to 190°C over 3 hours, then to 230°C for
5：5 hours, and finally to 260°C under reduced pressure. Data Analysis Methods:
The size and dispersive properties of nano-ZnO, the crystallization and melting properties, and the thermal properties were analyzed using TEM, XRD, TGA, and DSC.
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Transmission electron microscopy
JEM-2010
JEOL Company
To observe the dispersion behavior of the ZnO nanoparticles in the PA6 matrix.
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X-ray diffractometer
D/max 2550 V
Phillips
To obtain XRD patterns of the as-prepared PA6/ZnO nanocomposites.
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Thermogravimetric analyzer
TG/SDTA851e
Mettler Toledo
To analyze the thermal stability properties of PA6 and PA6/ZnO nanocomposites.
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Differential scanning calorimeter
DSC822e
Mettler Toledo
To study the crystallization temperature and melting temperature of PA6 and PA6/ZnO nanocomposites.
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Universal tensile testing instrument
WDW-10D
Jinan Hengxu Testing Machine Technology Co., Ltd.
To analyze the tensile strength of the materials.
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Impact testing instrument
ZBC-1400-2
Jinan Hengxu Testing Machine Technology Co., Ltd.
To evaluate the impact strength of the materials.
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Ubbelohde viscometer
To determine the molecular weight of the PA6 in PA6/ZnO nanocomposites.
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High speed block-on-ring test rig
MRH-3
To measure the friction properties and wear behaviors of PA6 and PA6/ZnO nanocomposites.
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