TY - JOUR
T1 - A time-of-flight secondary ion mass spectrometry study of sequential polymers with a well-defined segmental length
AU - Li, Lin
AU - Chan, Chiming M.
AU - Ng, Kai Mo
AU - Lei, Yuguo
AU - Weng, Lu Tao
N1 - Funding Information:
This work was supported by the Hong Kong Government Research Grants Council under grant number HKUST 9123/97P.
PY - 2001/7/1
Y1 - 2001/7/1
N2 - Two series of sequential polymers (6FBA-Cn and BA-Cn) have been synthesized by phase-transfer catalyzed polyetherification of 1, n-dibromoalkane (n = 4, 6, 8, 10, 12, 14 and 18) with 4,4′-(hexafluoroisopropylidene)diphenol (6FBA) and bisphenol A (BA). The effects of the flexible aliphatic segment length on the structure of secondary ions were investigated. The characteristic secondary positive and negative ions in the time-of-flight secondary ion mass spectrometry (ToF-SIMS) spectra are related to the chemical structures of the sequential BA-Cn and 6FBA-Cn polymers. The emission of the characteristic secondary positive and negative ions occurs after cleavage of the C-O bonds of the polymer repeat units. In the ToF-SIMS negative spectra, a series of small peaks separated by 14 amu provides the information about the flexible segment lengths of the repeat units of the BA-Cn and 6FBA-Cn polymers and can be used to directly determine the number of the -CH2- groups, n, of the flexible segment.
AB - Two series of sequential polymers (6FBA-Cn and BA-Cn) have been synthesized by phase-transfer catalyzed polyetherification of 1, n-dibromoalkane (n = 4, 6, 8, 10, 12, 14 and 18) with 4,4′-(hexafluoroisopropylidene)diphenol (6FBA) and bisphenol A (BA). The effects of the flexible aliphatic segment length on the structure of secondary ions were investigated. The characteristic secondary positive and negative ions in the time-of-flight secondary ion mass spectrometry (ToF-SIMS) spectra are related to the chemical structures of the sequential BA-Cn and 6FBA-Cn polymers. The emission of the characteristic secondary positive and negative ions occurs after cleavage of the C-O bonds of the polymer repeat units. In the ToF-SIMS negative spectra, a series of small peaks separated by 14 amu provides the information about the flexible segment lengths of the repeat units of the BA-Cn and 6FBA-Cn polymers and can be used to directly determine the number of the -CH2- groups, n, of the flexible segment.
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U2 - 10.1016/S0032-3861(01)00153-7
DO - 10.1016/S0032-3861(01)00153-7
M3 - Article
AN - SCOPUS:0343774043
VL - 42
SP - 6841
EP - 6849
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 16
ER -