Preparation And Characterization Of PA1010 Toughened By Nano Rubber

PA1010 has very comprehensive applications as a particular engineering plasties in our country. But it is sensitive to notch at low temperature and dry state, leading to low notch impact strength. Such restricts its applications in the field of constructional material. Thus, measures must be taken to toughen it. Nanophase rubber is an elasticizer springed up in the recent years. Especially for ultrafine fully-vulcanized powered rubber series, the processing technique of composites with that kind of rubber is simple and convenient. Only by easy mechanical blending can the nanophase rubber be dispersed in nanometer scale. So much attention is paid to the unique toughened effect. However, the paper on PA1010 toughened by nanophase rubber is not seen by far. Therefore, a series of composites with outstanding comprehensive properties and high tenacity are prepared by blending PA1010 and ultrafine fully-vulcanized acrylate rubber(UFAPR). In addition, appropriate contents of compatilizer is added to further toughened effect. Many testings are carried out such as mechanical properties, melting and crystal behaviors, rheology, crystal structures and morphology, and microstructures. The primary results are as followed: 1 . Three series of composites are prepared by melting blending. They are PA1010/UFAPR , PA1010/POE-g-MAH , PA1010/UFAPR/POE-g-MAH. Be of inferior compatibility for PA1010/UFAPR series, which mechanical properties are improved a little. PA1010/POE-g-MAH composites have advanced impact strength, but its rigidity decreases greatly. We gain PA1010/UFAPR/POE-g-MAH blends after putting POE-g-MAH into PAIOIO/UFAPR. It has a big boost in impact strength and reduction in rigidity to some extent. And we achieve PA1010 composites with excellent mechanical properties.2. DSC testing reveals that the melting curves of PA1010 composites is a double peak. Compared with neat PA1010, the melting enthalpy of peak in low temperature region is reduced, otherwise, the one in high temperature region is hoisted. The crystal peaks of three series of PA1010 composites are all moved to high temperature region.3. Rheological properties of PA1010 composites are researched in the range of 240-270℃ with Haake rheometer. All of them are pseudoplastic fluid. The non-Newtonian indexes and activation energies of viscosity flow of them are lower than neat PAIOIO. At the same temperature, the non-Newtonian indexes of composites fall with the rise of the content of UFAPR or POE-g-MAH. For the same sample, the activation energies of composites decrease gradually with the increase of the rate of shear.4. WAXD results prove that PA1010/POE-g-MAH series don't change the crystal structures of neat PA1010. For the PA1010/UFAPR and PA1010/UFAPR/ POE-g-MAH blends, the increasing content of UFAPR transforms the crystal structures of blends from α to γ form. Seen from PLM photographs, spherocrystal shapes convert from mixed radial 6-sectional to asymmetrical 4-sectional with incremental content of UFAPR. The degree of integrity is reduced. The dimensions of spherulites turn smaller firstly and then bigger. All the sizes are less than neat PA1010, that trend agrees with notch impact strength.5. SEM pictures show imbricate structures for PA1010/UFAPR, while layer structures are exhibited in PA1010/POE-g-MAH and PA1010/UFAPR/ POE-g-MAH blends. The toughed mechanism of them is shearing strain and yielding. AFM images depict that UFAPR particles are spreaded around PA1010 matrix according to a certain size distribution. Whereas only waves are dispersed evenly in PA1010/POE-g-MAH and PA1010/UFAPR/POE-g-MAH. Such proves the disperse phases of these two series can reach fine dispersion in PA1010 mastrix.