Reference

Relation between composition and viscoelastic properties of dental temporary soft lining materials

Relation between composition and viscoelastic properties of dental temporary soft lining materials. Niekawa, Katsuyoshi (Univ. Hosp., Tokyo Med. Dent. Univ., Tokyo 113, Japan). Kokubyo Gakkai Zasshi, 53(1), 157-83 (Japanese) 1986. CODEN: KOGZA9. ISSN: 0300-9149. DOCUMENT TYPE: Journal CA Section: 63 (Pharmaceuticals) The title relationship was studied exptl. by evaluating the creep characteristics using the Voigt 4-element model. The mol. wt. (2 or 4.5 ′ 102) of poly(Et methacrylate) (I) [9003-42-3] powder had a significant effect on the retarded elasticity (E2.h2) and the viscous flow (h3). However, it had small effect on the instantaneous elasticity (E1). The higher the mol. wt. of I was, the higher the increasing tendency of h3 with the aging time was. A neg. correlation was obsd. between I particle size (60-100, 120-140, and >200 mesh), and E1. The plasticizer butylphthalyl butylglycolate [85-70-1] gave 2-3-fold higher moduli than benzyl benzoate [120-51-4], and all moduli decreased with an increase in their amt. EtOH [64-17-5] content significantly decreased all moduli during several days after processed.

Degradation of phthalic acid esters by bacteria

Degradation of phthalic acid esters by bacteria. Nagata, Eizo; Kinoshita, Shinichi; Okada, Hirosuke (Dep. Ferment. Technol., Osaka Univ., Suita, Japan). Hakko Kogaku Zasshi, 54(9), 631-4 (Japanese) 1976. CODEN: HKZAA2. DOCUMENT TYPE: Journal CA Section: 60 (Sewage and Wastes) Section cross-reference(s): 10 The microbial degrdn. of DOP [117-81-7] and di-Bu phthalate (DBP) [84-74-2], was studied. The bacterial strain PB73 was used as a DBP utilizing bacterium and the strain PO32 as a DOP utilizing bacterium. Strain PB73 degraded 90% DBP and strain PO32 80% DOP in a medium contg. >20% of the resp.Several substances with their cas registry numbers 85-70-1 and 84-74-2 may be metioned in this study. ester. The optimal growth of strain PO32 was obtained at pH 7.4 at 34.degree., and of the strain PB73 was similar. Strain PB73 could degrade di-Et phthalate (DEP) [84-66-2], DBP, and Bu phthalyl Bu glycolate (BPBG) [85-70-1], but not DOP. Strain PO32 could degrade DEP, DBP, DOP, and BPBG. Neither strain could degrade di-Me phthalate or terephthalic acid or its esters. .