Diels-Alder Polymers from Resinic Acids
A new class of polyhydroxyesterimides has been synthesized by the Diels-Alder (DA) reaction between dihydroxyesters of resinic acids (RA) and dihydroxyesters of carboxyphenylmalcimide (CPMI). Dihydroxyesters of RA and CPMI have been synthesized by reaction between of epoxy resins (diglycidyl ether of bisphenol A, diglycidyl ether of hydroquinone and diglycidyl of aniline) and RA and CPMI. These monomers of AA, AB and BB type were then allowed to polymerise under DA reactions. The obtained polymers are solid, brittle, soluble in high and medium polar solvents and present good thermal properties.
Objective :To study the association of the angiotensin converting enzyme (ACE) insertion/deletion (I/D) polymorphism with essential hypertension in Chongqing. Methods:We use polymerase chain reaction (PCR) method to amplify sixteenth intron of ACE gene to analyse 114 healthy controls and 75 patients with essential hypertension. Polymorphism was characterized by three genotypes: homozygous alleles DD, II, and heterozygous alleles ID. Results:The frequency of homozygous alleles DD and the frequency of deletion alleles were significantly higher in the essential hypertension group than in the healthy controls (P0.005). Conclusion:The results indicate that a deletion polymorphism of ACE gene is associated with essential hypertension in Chongqing.