Research Of Blend Components And Fiber Properties Of Polyolefin/Phenyl Silicone Rubber Composite Elastomers

Since the invention of elastic fiber in 1937 till the successful creation of DOW XLA in2002,the categories and production technology of elastic fiber have been greatly enriched and developed in the past 65 years.Composite polyester,polyether,polyurethane,polyolefin elastic fiber,etc.have been widely used in their own application field.As a kind of high elastic fiber which is still in research stage,polyolefin/phenyl silicone rubber composite elastic fiber has great potential to reach the level in the performance combine with Spandex and the XLA.Moreover,the high efficiency and environmental protection in production technology and advantage in manufacturing costs,not only fit the theme of today’s energy-saving and environmental protection,bu t also meet with the trend of technological innovation.In this paper,the author optimizes the blending component of polyolefin and phenyl silicone rubber,and the properties and vulcanization treatment of polyolefin and phenyl silicone rubber was also studied.The author tried to find breakthrough from the blending component configuration and the vulcanization crosslinking process to invent a more stable composite elastic fiber.The research work of this article mainly includes the differences in mechanical and morphological structures of four silicone rubber which have different phenyl content and molecular weight blends with polyolefin elastomers.Through comparing the tensile properties and morphology of the mixture,it was found that the PVMQ-3 and PVMQ-4 with high molecular weight were more difficult to realize the mutual integration with the polyolefin elastomers.The tensile properties,crystallization properties and composition of the groups were studied after mixing and different radiating of phenyl silicone rubbers.By comparing the mechanical,crystallographic conditions and infrared spectra of the samples before and after the radiation treatment,the author found that the silicone content of the silicone rubber with little difference in molecular weight could affect the dispersion of the silicone rubber in the polyolefin elastomer.The PVMQ-1 is better than PVMQ-2 to achieve blending effect with polyolefin elastomers and will not affect the radiation crosslinking reaction.The crosslinking reaction of polymer mixture under different vulcanization cross-linking processes was studied.The results show that when the radiation dose is less than30 kGy,the degree of crosslinking is very low(≤5%);when the radiation dose is30kGy~90kGy,the transition will reach to 70%;when the radiation dose 180kGy~210kGy,the transition will rise to 90%;then continuing to increase the radiation dose will lead to completely cross-linking.The subject also studied the tensile and elastic recovery properties of the formulation components after spinning.The tensile strength and elastic recovery properties of the fibers obtained by spinning with the polymer blends were studied by UV and radiation treatment.It was found that the breaking strength of polyolefin/ phenyl silicone rubber composite elastic fibers was similar to that of spandex and XLA also has a certain gap,tensile elongation at break(≥800%)will be significantly better than spandex and XLA(≤700%);In addition,the average elastic recovery of polyolefin/phenyl silicone rubber composite elastic fiber is nearly85%,which is better than 59% of XLATM mentioned in the literature and lower than spandex which is 89.63%.