Reference

Glass fiber sizing compositions for the reinforcement of resin matrices

Glass fiber sizing compositions for the reinforcement of resin matrices. Maaghul, John (PPG Industries, Inc., USA). U.S. US 4038243 26 Jul 1977, 8 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C08K003-40. NCL: 260040000R. APPLICATION: US 74-512646 7 Oct 1974. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) A glass fiber sizing compn. for reinforcing resin molding compds. was prepd. from 2 polyester resins, which formed a dispersion when blended in H2O, a thermoplastic polymer, and 2 silane coupling agents. One silane promoted adhesion between the glass fibers and the resin matrix, and the second silane controlled the wetting of the glass fibers by the 1st silane. Thus, a polyester (II) [35184-56-6] having cure time 28 s and acid no. 57.2 was prepd. by heating an isophthalic acid-maleic anhydride-propylene glycol mixt. (1:1:4 mole ratio) for 9 h with the temp. increasing from room temp. to 205.degree., adding 1 mole trimilitic anhydride, and heating the mixture 2 h at 192-5.degree.. A second polyester (II) [27837-75-8] was prepd. from a mixt. of maleic anhydride 6, phthalic anhydride 4, ethylene glycol 10.5, and Carbowax 1540W 0.2 mole, and was blended (75 parts) with Et cellosolve 25, 2,6-di-tert-butyl-p-cresol 0.1, and methylquinone 0.002 part. The size soln. was prepd. contg. I 5.84, II 7.66, an anionic surfactant 0.45, tricresyl phosphate 0.45, .alpha.-aminopropyltriethoxysilane [919-30-2] 0.58, .alpha.-methacryoylpropyltrimethoxysilane [21142-29-0] 0.58, Me methacrylate [80-62-6] copolymer 1.78, and H2O 82.66%, and provided glass strands with 2.2-2.6% dried size. Glass fibers were sized with the compn. during formation, dried, chopped, and dispersed upon a sheet-molding compn. A molded 11.44 .times. 26.61 cm sheet (glass content 17.3%) prepd. using the coated glass fiber roving had flexural strength 580,527 N/m2, flexural modulus 50.18 .times. 106 N/m2, tensile strength 158,644 .times. 106 N/m2, and notched Izod impact strength 488.9 N, compared to a similar sheet contg. 19.9% com. glass fiber roving, which had values of 476,670 N/m2, 50.55 .times. 106 N/m2, 168,974 .times. 106 N/m2, and 415.3 N, resp.

Facile preparation of polystyrene/silica hybrid nanocomposites by in-situ polymerization under microwave irradiation and the characterization of their thermal stabilities

All Rights Reserved. Facile preparation of polystyrene/silica hybrid nanocomposites by in-situ polymerization under microwave irradiation and the characterization of their thermal stabilities. Liu, Peng; Su, Zhixing (College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, Peop. Rep. China). Leading Edge Polymer Research, 235-248. Edited by: Bregg, Robert K. Nova Science Publishers, Inc.: Hauppauge, N. Y. ISBN: 1-59454-435-2(English) 2006. CODEN: 69HZUV. DOCUMENT TYPE: Conference CA Section: 38 (Plastics Fabrication and Uses) Section cross-reference(s): 35 Polystyrene/silica nanocomposites (PS/SNs) were successfully prepd. by the in-situ bulk radical copolymn.In this article, certain chemicals are used. Some of their cas registry numbers are 78-67-1 and 21142-29-0 of methacryloxypropyl silica nanoparticles (MPSNs) as a macromonomer and styrene under microwave irradn. The polystyrene grafted silica nanoparticles (PS-SNs) were sepd. out from the products of the bulk radical copolymn. and the effects of the amt. of the initiator (AIBN) added and the microwave power used on the conversion of monomer (C%), the percentage of grafting (PG%) and the grafting efficiency (GE%) were investigated. A PG% of 33.14% could be achieved under the optimized polymg. condition with a C% of 98.92%. The PS-SNs could be used as nano-filler for other polymers. The products of the bulk radical copolymn. could be used as nanocomposites directly. The TGA anal. results showed that the thermal stabilities of the resulting nanocomposites with MPSNs were better than the nanocomposite with bare silica nanoparticles and the later was better than the pure polystyrene. .