PMID- 9680412
OWN - NLM
STAT- Publisher
LR  - 20191120
IS  - 0024-9297 (Print)
IS  - 0024-9297 (Linking)
VI  - 31
IP  - 15
DP  - 1998 Jul 28
TI  - Cis/Trans Reactivity: Epoxy-Amine Systems.
PG  - 4770-6
AB  - The reactivities of cis and trans isomers of 1,2-diaminocyclohexane 
      (1,2-DCH)/epoxy resin were studied separately. We found that the primary amine 
      hydrogen disappears in both isomers at a similar rate when they react with an 
      epoxy resin. However, the formation of tertiary amines differs considerably. The 
      reactivity of the second amine hydrogen for the trans isomer is greater than that 
      for the cis isomer, and this difference is observed as the reaction proceeds. The 
      main reason for the slower disappearance of the cis secondary amine is steric 
      hindrance and this fact is observed in the preexponential factors, glass 
      transition temperatures (Tg), and ratio of rate constants of secondary to primary 
      amine (R). The reaction was followed by Fourier transform infrared spectroscopy 
      in the near-infrared range. The values of Tg were obtained by differential 
      scanning calorimetry.
FAU - Lopez-Quintela, A
AU  - Lopez-Quintela A
AD  - Department of Physical-Chemistry, Santiago University, Spain, Department of 
      Analytical Chemistry, La Coruna University-GAIRESA, Spain, and Department of 
      Research, GAIRESA, 15551 Lago-Valdovino, La Coruna, Spain.
FAU - Prendes, P
AU  - Prendes P
FAU - Pazos-Pellin, M
AU  - Pazos-Pellin M
FAU - Paz, M
AU  - Paz M
FAU - Paz-Abuin, S
AU  - Paz-Abuin S
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Macromolecules
JT  - Macromolecules
JID - 0365316
EDAT- 1998/07/29 00:00
MHDA- 1998/07/29 00:00
CRDT- 1998/07/29 00:00
PHST- 1998/07/29 00:00 [pubmed]
PHST- 1998/07/29 00:00 [medline]
PHST- 1998/07/29 00:00 [entrez]
AID - ma9713365 [pii]
AID - 10.1021/ma9713365 [doi]
PST - ppublish
SO  - Macromolecules. 1998 Jul 28;31(15):4770-6. doi: 10.1021/ma9713365.