Citation: Hui-zhen Du, Fei Yang, Kun-yu Zhang, Zhe Ma, Bin Wang, Li Pan, Yue-sheng Li. Study on Compatibilizing Polypropylene/Nylon 11 Blends by Isotactic Polypropylene Ionomers[J]. Acta Polymerica Sinica, ;2018, 0(12): 1539-1547. doi: 10.11777/j.issn1000-3304.2018.18090 shu

Study on Compatibilizing Polypropylene/Nylon 11 Blends by Isotactic Polypropylene Ionomers

Hui-zhen Du ¹ ,
Fei Yang ¹ ,
Kun-yu Zhang ² ,
Zhe Ma ¹ ,
Bin Wang ¹ ,
Li Pan ^1,, ,
Yue-sheng Li ¹

1.
Tianjin Key Lab of Composite & Functional Materials and School of Materials Science and Engineering, Tianjin University, Tianjin 300350
2.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350

Corresponding author: Li Pan, lilypan@tju.edu.cn
Received Date: 22 March 2018
Revised Date: 12 April 2018
Available Online: 18 September 2018

The copolymers of propylene/11-iodo-1-undecene were taken as intermediates and the iodine group underwent a nucleophilic substitution reaction or click reaction with N-methylimidazole or 2-mercaptonoaniline to prepare isotactic polypropylene ionomers. Isotactic polypropylene (iPP) and bio-renewable polyamide 11 (PA11) were mixed with the isotactic polypropylene ionomers to prepare novel polymer blends with excellent physical properties. The miscibility, morphology and mechanical properties of iPP/ionomer blends, PA11/ionomer blends and iPP/PA11/ionomer blends were investigated, respectively. DMA analysis revealed that miscibility of iPP and PA11 was improved by addition of the isotactic polypropylene ionomers, which served as an effective compatibilizer and played a key role in improving toughness of iPP/PA11 blends. As observed, particles size of the dispersed phase (PA11) was significantly reduced from about 20 μm to 1 μm in the ternary blends of iPP/PA11/ionomer. Interface between the matrix and the dispersed phase became blurred and the gap disappeared in the ternary blend of iPP/PA11/ionomer (70/30/5), as observed on the SEM images of the cryo-fractured surface of the blend. Accordingly, notched impact strength of the same ternary blend was greatly improved from 2.11 kJ/m² to 6.73 kJ/m² without significantly sacrificing the tensile strength. To further study the toughening effect of iPP/PA11/ionomer ternary blends, the fracture surface of the impact specimen was also investigated. As proved, the iPP/PA11 (70/30) blend showed a smooth and featureless fracture surface without evident deformation, indicating a typical brittle fracture behavior, while the fracture surfaces of the ternary blends was increasingly rough and many irregularities were clearly observed, indicating a ductile fracture behavior. Here we proved that the synthesized isotactic polypropylene ionomers enhanced the two-phase interface interaction and the compatibility in the iPP/PA11/ionomer ternary blend. It is therefore a very promising and effective compatibilizer for iPP/PA11 blends. Moreover, the resulting iPP/PA11 blends with excellent impact properties and tensile properties are very promising in practically application.
- Isotactic polypropylene,
- Ionomers,
- Polyamide 11,
- Compatibilization,
- Blend
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