摘要
用GC-MS对甲基苯基硅氧烷混合环体(Me2n-iPhiSinOn)样品进行分析,鉴定出了25个组分,其中包括甲基硅氧烷环体、含1个苯基的甲基硅氧烷环体以及含2个苯基的甲基硅氧烷环体。四甲基二苯基环三硅氧烷环体(Me4Ph2Si3O3)的2个异构体、六甲基二苯基环四硅氧烷环体(Me6Ph2Si4O4)的4个异构体都得到有效分离和归属,并且发现其各异构体的含量比例符合随机环化的理论值。同时对该混合环体的苯基/甲基比例以及苯基含量进行了计算,并得到氢谱的验证。
Cyclic （ Me2n-iPhiSinOn ）, formed by the pyrolysis of HO-（ MePhSiO）n-（ MeESiO ） m-H, was analyzed by GC-MS on an HP-Sms capillary column, and 25 compounds were identified by library search and interpretation of the mass spectra, including cyclic （ MeESiO ）n （ n = 3 - 7 ）, cyclic （ Me2n-1PhSinOn ） and cyclic （Me2n-2PhESinOn）. Two isomers of Me4Ph2Si3O3 （D3^2Ph） and four isomers of Me6Ph2Si4O4 （D42Ph） were separated respectively, and it was found that there was a statistical distribution of the isomers for every oligomethylphenylcyclosiloxanes（ D32Ph, D42Ph and D5^2Ph）. The phenyl content and the Phenyl/methyl ratio in the sample were also obtained, and validated with ^1H NMR.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2008年第8期1129-1132,共4页
Chinese Journal of Analytical Chemistry
基金
浙江省高校青年教师资助计划(2005年)
浙江省教育厅科研项目(No.20051896)资助
关键词
甲基苯基硅氧烷混合环体
气相色谱-质谱法
顺反异构体
苯基
Cyclic mixture of methylphenylcyclosiloxanes, gas chromatography-mass spectrometry, cis- and trans- isomers, content of phenyl group
