Preparation of Monomer Casting Nylon-6-b-Polydimethylsiloxane Copolymers with Enhanced Mechanical and Surface Properties

Q2 Materials Science

Polymer-Plastics Technology and Engineering Pub Date : 2018-11-02 DOI:10.1080/03602559.2017.1410846

Jie Ying, Wenqi Wang, Xing Peng, Zhoutong Qiu, Xiang Ma, Sai Zhang, Jikui Wang

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引用次数: 11

Abstract

ABSTRACT Nylon-6-b-polydimethylsiloxane copolymer was synthesized with macroinitiator through in situ polymerization. The macroinitiator with two chain-growing centers per molecule is based on hydroxyl terminated polydimethylsiloxane (PDMS) functionalized with diisocyanate. The influence of PDMS contents on the properties of copolymers was studied. Differential scanning calorimetry and X-ray diffraction were used to investigate the melting temperature, crystallization temperature and crystal form of samples, and the results showed that the crystallinity of polymers decreased. The mechanical properties of samples were studied by notched-impact testing and tension test. The notched impact strength was improved by 200% with PDMS concentration up to 4 wt%. The form of scaly was seen by scanning electron microscope proved the improvements of the impact strength of the copolymer. The water contact angles test showed that the surface tension of copolymers decreased with the PDMS content increasing and the surface of copolymer changed from hydrophilic to hydrophobic. GRAPHICAL ABSTRACT

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提高机械性能和表面性能的单体铸造尼龙-6-b聚二甲基硅氧烷共聚物的制备

摘要采用原位聚合的方法，用高分子引发剂合成了尼龙-6-b聚二甲基硅氧烷共聚物。该高分子引发剂以端羟基聚二甲基硅氧烷(PDMS)为基料，二异氰酸酯功能化，每个分子具有两个链生长中心。研究了PDMS含量对共聚物性能的影响。采用差示扫描量热法和x射线衍射法研究了样品的熔融温度、结晶温度和结晶形态，结果表明聚合物的结晶度下降。通过缺口冲击试验和拉伸试验研究了试样的力学性能。当PDMS浓度达到4 wt%时，缺口冲击强度提高200%。扫描电镜观察到鳞片的形成，证明了共聚物抗冲击强度的提高。水接触角测试表明，随着PDMS含量的增加，共聚物的表面张力降低，共聚物表面由亲水性变为疏水性。图形抽象

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