1、中文 3100 字 ,2000 单词， 10500 英文字符 出处： Sahin S, Yayla P. Effects of processing parameters on the mechanical properties of polypropylene random copolymerJ. Polymer Testing, 2005, 24(8):1012-1021. 本科生毕业设计（论文）外文译文 学 院 专 业 导 师 学 生 学 号 Effect of testing parameters on the mechanical propertiesof polypropylene
2、 random copolymer Senol Sahin, Pasa Yayla* Mechanical Engineering Department, Engineering Faculty, Kocaeli University, 41040 Kocaeli, Turkey Received 24 January 2005; accepted 2 March 2005 Abstract: The effects of temperature on the impact resistance and hardness of polypropylene random copolymer ar
3、e studied for a wide range of temperatures. The variations in the mechanical properties with a wide range of strain rates are also evaluated. Finally, the variations in mechanical properties as a function of time after production are studied. Keywords: Polypropylene random copolymer; Mechanical prop
4、erties; Storage time; Strain rate 1. Introduction There is a vast literature on processing, morphology, testing and ultraviolet (UV) degradation of polypropylene(PP) 13. However, the literature lacks results on the effects of storage time, outdoor ageing time and the addition of different master bat
5、ches at different ratios on the mechanical properties. This may be connected to the fact that those investigations are very rigorous and time-consuming. For these reasons, the aim of this paper is to study the influence of testing parameters on the mechanical and thermal properties of injection moul
6、ded polypropylene random copolymer(PP-R) samples with different storage times. 2. Experiments 2.1. Materials The polymer used in this study is a natural colour PP-R, produced by Borealis s. a, trade name RA 130E, and supplied in granular form. The properties of the polymer are given in Table 1. 2.2. Specimen preparation A specially designed injection mould was used t
