摘要
研究了含乙烯基聚二甲基硅氧烷与高压聚乙烯的合金膜(简称PDMVSPEM)的制膜、辐射剂量和材料配比等对PDMVSPVSPEM的氧氮透过选择性、力学性能和表面特性的影响,初步讨论了结构与性能的关系。只要满足温度条件,易用机械共混获得组份分布均匀的合金膜。膜的辐照效应与剂量的关系表现为剂量<0.04兆戈瑞时,产生交联;>O.04～0.08兆戈瑞,交联与裂构同时均匀进行;>0.08兆戈瑞,裂构占主导。在上述辐照剂量范围内,PDMVSPEM的P_(O_2)和α_((O_2)/N_2)未见改变;随PE含量增加,膜的P_(O_2)。呈非对称S形变化,拉伸模量E较拉伸强度δ增长快,断裂伸长ε沿U字形变化。谷底在PE含量40～50％,此刻形态结构处于相逆转阶段,并对应于膜凝胶生成量的低点。PDMVSPEM的相区尺寸很小,仅当PE含量>70％时,SEM图中方可现察到较明显的相分离结构,在PDMVSPEM的最表面层(约 5nm)产生有机硅链段的富集。即使PE含量高达90％,膜的表面特征仍与纯聚甲基硅胶的颇为相近。
The influences of radition dosage and polyethlene content on the function character-istic of alloy membrane (PDMVSPEM) from vinly-containtion polydimethylsiloxane(PDMVS).and PE after crosslinking induced by r-ray radiation were studied. The rela-tionship between structure and property of the PDMVSPEM was also discussed.It wasfound that the homogeneus member of PDMVS-PE was easily prepared by thermal me-chanic blend if temperature condition had been satified. The radiation effects of thePDMVSPEM was radiation dosage display as follows:when the radiation dosage < 0.04MGy it produces crosslinking; >0.04 MGy the crosslinking and degradationproceedequilibrium at the same time; while > 0.08 MGy the degradation is prepondance.The gas permeability of the PDMVSPEM has not chang. The Po_2 decreased contineuslyas asymmdetric S type and the enchancing speed of tensile modulus Eis greater than thatof tensile strength δ, whereas the breaking elongation εvarried along an U trail with in-creasing of PE content in the PDMVSPEM. The varried bottom of which is corre-sponding to the phase inversion point, appears at 40--50% of PE content. Measurementof XPS and water contact angle indicate that the PDMVS segment are enriched at thesurface than that in bulk and though the surface charateristic of the PDMVSPEM con-taining 90% of PE is still similar to that of pure ailicone rubber.
出处
《功能高分子学报》
CAS
CSCD
1989年第1期39-44,共6页
Journal of Functional Polymers
关键词
辐射交联
合金膜
硅氧烷
聚乙烯
Radiation Crosslinking
Alloy Membrane
Permselectivity of Oxygen and Nitrogen
Mechanical Property
