1/12/2024 0 Comments Flexture modulus![]() The density was calculated from results of gas pycnometer (Micromeritics, Norcross, GA, USA AccuPyc II 1340) measurement. Thermal analysis was conducted by a differential scanning calorimeter (NETZSCH, Selb, Germany DSC 404 F3 pegasus), at a heating rate of 2 ☌ per minute. The specimens were fractured in liquid nitrogen and coated with platinum. The sample morphology was investigated using a scanning electron microscope (JEOL, Tokyo, Japan JSM-6510LV) with an acceleration voltage of 5 kV. The flexural modulus was measured using an Autograph (Shimadzu, Kyoto, Japan AG-250kNG) with a crosshead speed of 1 mm per minute. The Charpy impact strength of V-notched specimens (depth of 2 mm, apex radius of 0.25 mm) was measured using an impact tester (Yasuda Seiki Seisakusho, Hyogo, Japan No. The resulting PA11/PBS compounds were formed into rectangular bars using a laboratory hot press (210 ☌, 20 MPa), and then rapidly cooled to room temperature by using a cooling press (32 ☌, 10 MPa). The dried pellets were melt mixed (barrel temperature: 210 ☌, screw rotation speed: 75 r.p.m., mixing time: 4 min) using an internal mixer (Toyoseiki, Tokyo, Japan Labo Plsastomill model 4C-150) at a predetermined mixing ratio. The PA11 and PBS pellets were dried in a vacuum oven for 6 h at 80 ☌ to eliminate water. The PBS was supplied by Mitsubishi Chemical (Tokyo, Japan Gs Pla FZ91PD, T c=90 ☌, T m=114 ☌, SPBS=1.31%). The PA11 used in this work has a crystallization temperature ( T c) of 168 ☌, a melting point ( T m) of 187 ☌ and a mold shrinkage ratio ( S PA11) of 0.81%, and was purchased from Arkema Japan (Tokyo, Japan Rilsan B BESN O TL). The relationship between impact strength and phase structure is also discussed.Ī PA11/PBS alloy was prepared by melt mixing. The impact strength of PA11 was enhanced by a factor of three by dispersing 20 wt% poly(butylene succinate) (PBS) particles using the melt compound method. In this paper, a method of improving the impact strength of PA11 without elastic modulus reduction is introduced. In contrast, elastic modulus reduction due to the rubber component has also been reported. 10 reported that a dilational stress field at the interface between the rubber component and the polymer matrix caused by shrinkage of the rubber component improves the impact strength of the alloy. 2, 3, 4, 5 The generation of crazing and cavitation inside and/or around the rubber component in the matrix polymer is known to improve the impact absorption of the alloy. However, even for PA11, the impact strength (8–15 kJ m −2) is less than one-fifth of polycarbonate (70–80 kJ m −2).Īs a method of improving the impact strength of plastics, alloying a matrix polymer with a compatibilizer and soft materials such as rubber has been studied. Polyamide 11 (PA11) has a relatively high impact strength for a bio-plastic, and is made from inedible plant oil extracted from castor seeds. 1 To expand bio-plastic usage, improvements in impact strength, heat resistance and flame resistance are required. Bio-plastics are widely used in dishes, packaging containers, automotive parts and electronic products.
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