【摘要】 为改善聚对苯二甲酸乙二酯(PET)的强度和韧性，拓展材料的应用领域，本研究以双羟基硅油(PDMS)为第三单体，与对苯二甲酸(PTA)、乙二醇(EG)通过一锅法熔融共聚，制备了一系列PDMS共聚改性的PET(SPET)。通过核磁共振、凝胶渗透色谱、热分析与力学测试等手段，系统研究了PDMS含量对SPET共聚酯结构、热性能、力学性能及表面特性的影响。结果表明，随着PDMS含量增加，共聚酯的结晶度逐渐降低，且由于两相极性差异，形成了微相分离结构，直接影响了SPET的宏观性能。SPET共聚酯拉伸性能和缺口冲击强度随PDMS含量增加呈先升高后降低的趋势，当PDMS占PTA的质量分数为10%时，获得SPET的拉伸强度和断裂伸长率达到最大值，分别为56.4 MPa和502.8%，对应缺口冲击强度为11.68 kJ/m~2，是纯PET的4.6倍。另外，PDMS的引入显著提升PET疏水性，当PDMS占PTA的质量分数由0%提升到20%时，SPET的水接触角则由89.0°提升至126.8°，对应的表面能由40.43 mN/m降低至29.64 mN/m。综上所述，通过调控PDMS含量可以实现对SPET性能的有效调控，为高性能PET聚酯新材料的开发提供了参考。更多还原

【Abstract】 To enhance the strength and toughness of poly(ethylene terephthalate)(PET) and broaden its application scope, a series of PET copolymers(SPET) modified with bishydroxysilicone oil(PDMS) as a third monomer were synthesized via one-pot melt copolycondensation from terephthalic acid(PTA) and ethylene glycol(EG). The effects of PDMS content on the structure, thermal properties, mechanical performance, and surface characteristics of SPET copolymers were systematically investigated using nuclear magnetic resonance, gel permeation chromatography, thermal analysis, and mechanical testing. The results indicate that with increasing PDMS content, the crystallinity of the copolymers gradually decrease. The polarity difference between the two phases led to the formation of a microphase-separated structure, thus directly influenced the macroscopic properties of SPET. The tensile properties and notched impact strength of SPET copolymers first increase and then decrease with the increase of PDMS content. When the mass fraction of PDMS relative to PTA reaches 10%, the resulting SPET exhibit the maximum tensile strength and elongation at break of 56.4 MPa and 502.8%, respectively, with a notched impact strength of 11.68 kJ/m~2, which is 4.6 times that of pure PET. Additionally, the introduction of PDMS significantly enhance the hydrophobicity of PET. As the mass fraction of PDMS relative to PTA increase from 0% to 20%, the water contact angle of SPET rises from 89.0° to 126.8°, while the surface energy decreases from 40.43 mN/m to 29.64 mN/m. In summary, the properties of SPET can be effectively regulated by adjusting PDMS content, offering insights for the development of high-performance PET-based materials.更多还原