Reference

Comparison of chemiluminescence with impact strength for monitoring degradation of irradiated polypropylene

Comparison of chemiluminescence with impact strength for monitoring degradation of irradiated polypropylene. Mendenhall, G. D.; Agarwal, H. K.; Cooke, J. M.; Dziemianowicz, T. S. (Dep. Chem. Chem. Eng., Michigan Technol. Univ., Houghton, MI 49931, USA). ACS Symp. Ser., 280(Polym. Stab. Degrad.), 373-85 (English) 1985. CODEN: ACSMC8. ISSN: 0097-6156. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 35 Chemiluminescence at ambient temp. and at 150° of several electron-beam irradiated polypropylene (I) [9003-07-0] formulations could be qual. correlated with loss of impact strength. The loss of impact strength of irradiated I at 25° and 60° was followed. Bis(dodecyl) 2,2'-thiodipropionate (II) [20611-90-9] exhibited a strong synergist effect with 1,3,5-tris(4-hydroxy-3,5-di-tert-butylbenzyl)cyanuric acid [27676-62-6] at room temp., but was active also alone at 60°. II alone at room temp. did not protect I from loss of phys. properties after irradn. Irradn. of I sealed in Al foil made little difference in properties compared with unsealed I. Fiber-optics was a convenient technique to isolate a heated sample from cooled photon-detecting equipment.

Polyphosphoramidite oligomers and stabilizer compositions thereof

Polyphosphoramidite oligomers and stabilizer compositions thereof. Chasar, Dwight W. (Goodrich, B. F., Co., USA). U.S. US 4522735 A 11 Jun 1985, 9 pp. (English). (United States of America). CODEN: USXXAM. CLASS: ICM: C07D203-06. ICS: C07D205-04; C07D211-06; C07D265-30. NCL: 252049900. APPLICATION: US 83-505516 17 Jun 1983. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Polyphosphoramidite oligomers I [A = NR1R2 (R1 = C1-4 alkyl), piperidino, morpholino, etc.; R2 and R3 = H or primary, secondary, or tertiary C1-4 alkyl; X = CH2, CHMe, CHEt, CHPr, or CMe2; Y = H, ClP(A), or HOP(A); Z = Cl, OH, or group II; n = 2-10] are prepd. and used, alone or in synergistic mixts. with a hydroxyphenylalkyl isocyanurate, as stabilizers to protect polymers, including polyolefins, against the effects of heat and O. Thus, 0.015 mol N-(dichlorophosphino)piperidine [27325-49-1] and 0.015 mol 4,4'-isopropylidenebis(2-tert-butylphenol) [79-96-9] in 50 mL Et3N were refluxed 20 h to prep. 4.5 g polyphosphoramidite (III) [97896-19-0] having no.-av. mol. wt. 1154. Polypropylene (IV) [9003-07-0] stabilized with 0.1% III became brittle after 26 1/3 days at 125° in air. IV stabilized with 0.05% III and 0.05% tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate [27676-62-6] became brittle after 391/3 days at 125° in air.