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余鼎声, HONG-WEI
Designed Monomers and Polymers, Vol. 9, No. 4, pp. 369-382 (2006),-0001,():
-1年11月30日
Phenolphthalein (3,3-bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone, B-hpi), reacted with paraformaldehyde and allylamine by the Mannich reaction, was investigated as the acid ingredient for the first time, and a novel benzoxazine was synthesized. In order to confirm the structure of benzoxazine, benzyl-terminated B-hpi (3,3-bis(4-benzyloxyphenyl)-1(3H)-isobenzofuranone, B-bpi) was prepared. The chemical structures of B-hpi, B-bpi and benzoxazine were compared by FT-IR, 1H-NMR and 13C-NMR; it was demonstrated that the lactone structure remains in the molecular structure of benzoxazine (3,3-bis(3-allyl-3,4-dihydro-2H-1,3-benzoxazine)-1(3H)-isobenzofuranone, B-adi). B-adi transformed into a quinoid structure in basic medium similar to that of B-hpi. Software of Accelrys' materials studio (DMol3), FT-IR and UV-Vis spectrophotometry were employed to investigate the properties of the quinoid structure of B-adi and B-hpi. In situ FT-IR spectra showed the thermal curing behavior of B-adi. The char yield of poly B-adi was about 40% by weight at 800◦C in nitrogen atmosphere, as determined by TGA. Tg values for this poly B-adi were as high as 273◦C and 295◦C from the maximum of loss modulus and tan δ by DMTA, respectively.
Phenolphthalein,
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余鼎声, DING
CHEM. RES. CHINESEU. 2003, 19 (4), 464-469,-0001,():
-1年11月30日
The influence of Ultrafine Full-Vulcanized Acrylate Powdered Rubber (U FA PR) on the iso thermal crystallization kinetics and noniso thermal crystallization behavior of PA 6 has been studied by means of DSC. The results show that with the introduction of a small amount of U FA PR, the crystallization rate of PA 6 can be increased obviously, and the crystallization temperature range can be augmented and the crystallite size distribution of the crystal can be narrowed down. The change of free energy perpendicular to the crystal nucleus, which has been calculated according to the Hoffman theory, is consistent with the result of Avrami’s equation. The unit surface free energy of the radial-developing crystal spherulite decreases while the crystallization rate of PA 6 increases with the introduction of U FA PR. Meanwhile, it is shown by means of the polarizing micro scope (PLM ) that the crystal size drops down and the number of the crystal grains augments with the addition of U FA PR, which shows that U FA PR can function as anucleating agent.
PA
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余鼎声, Qiao
WILEY-VCH Verlag GmbH& Co. KGaA, Weinheim Macromol. Rapid Commun. 2005, 26, 1878-1882,-0001,():
-1年11月30日
bisoxazoline,
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余鼎声, Hongying
Journal of Applied Polymer Science, Vol. 102, 3848-3856 (2006),-0001,():
-1年11月30日
The
POSS,
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余鼎声, Xuejia
Journal of Applied Polymer Science, Vol. 91, 68-71 (2004),-0001,():
-1年11月30日
The
chain,
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