MHMWPE/iPP/EPDM渔用单丝的力学性能与动态力学行为

The mechanical properties and dynamic mechanical behavior of MHMWPE/iPP/EPDM fishery monofilaments

采用中高分子量聚乙烯(MHMWPE)、等规聚丙烯(iPP)、乙丙橡胶(EPDM)进行熔融共混、纺制MHMWPE/iPP/EPDM渔用共混单丝,研究i PP和EPDM含量对共混单丝的力学性能和动态力学行为的影响。结果显示,iPP或EPDM含量基本不会对共混单丝中MHMWPE的玻璃化转变温度(T_g)造成影响。共混单丝中iPP含量的增加使MHMWPE的结晶生长受阻,结晶度下降,α峰对应损耗因子峰值(tanδα)下降,α峰峰温(Tα)向高温移动。共混单丝中EPDM含量的增加使MHMWPE的结晶度下降,α转变移向低温,tanδα增加。研究表明,一定含量的iPP可有效改善共混单丝的力学性能,提高单丝的断裂强度和结节强度,EPDM的引入可进一步增加渔用单丝韧性和结节强度。

With the development of aquaculture,it is an important development direction of fishery engineering to design new types of fiber nets.Polyethylene is widely used in fishery because of its high strength,light weight and cost-effectiveness.However,there are also the problems such as easy to damage for ordinary polyethylene fiber net in aquaculture.Middle high molecular weight polyethylene（MHMWPE） monofilaments have greater molecular weight,higher strength and cost-effectiveness than high density polyethylene（HDPE）,which can be prepared by melt-spinning and drawing process.To obtain better mechanical property,we should be willing to modify MHMWPE monofilaments.MHMWPE,isotactic polypropylene（iPP） and ethylene propylene diene monomer（EPDM） were melt blended to spin fishery monofilaments.The effect of the iPP and EPDM contents on the dynamic mechanical behavior and tensile strength of the blending monofilaments was studied by thermal property analysis,dynamic mechanical properties analysis and mechanical properties testing.Results showed that Tg was influenced neither by iPP content nor by EPDM content.The degree of crystallinity and the maximum of loss factor（tanδα） for MHMWPE decreased while the temperature of α-transition increased with the increase of iPP content.In addition,the degree of crystallinity decreased,α-transition moved to low temperature and the value of tanδα increased with the increase of EPDM content.The stretching strength and knot strength increased by increasing iPP content to a certain value.The toughness and knot strength of the fishery blending monofilaments were further raised by blending of EPDM.