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    • 2. 发明授权
    • Use of sucrose-based additives as non-crosslinking agents to produce
polymers having enhanced thermal stability
    • 使用蔗糖基添加剂作为非交联剂来生产具有增强的热稳定性的聚合物
    • US5563192A
    • 1996-10-08
    • US466622
    • 1995-06-06
    • Navzer D. SachinvalaRedford F. JuMorton H. Litt
    • Navzer D. SachinvalaRedford F. JuMorton H. Litt
    • C07H15/04C08F216/12C08F216/14C08F220/30C08G59/32F02B75/02C08K5/15C08L33/12
    • C07H15/04C08F216/125C08F216/1416C08F220/30C08G59/32F02B2075/027
    • A method for producing stabilized polymers, exhibiting enhanced thermal stability, which comprises polymerizing a mixture comprising: a monomer comprising an allyl-containing group which is bonded to primary and/or secondary hydroxyl groups on a saccharide, preferably a long chain (C.sub.3 -C.sub.20) allyl-containing ether group on the hydroxyl group; and one or monomers selected from methacrylate ester monomers, acrylate ester monomers, acrylamide monomers and styrene monomers, in mounts sufficient to produce a polymer exhibiting enhanced thermal stability. Polymers having enhanced thermal stability are obtained using a monomer comprising an allyl-containing group which is bonded to primary and/or secondary hydroxyl groups on a saccharide, as a novel stabilization crosslinking agent. In addition, a method of using non-crosslinking sucrose-based monomers, preferably having a methyl, alkyl or crotyl ether on at least one of the hydroxyl groups of sucrose, in polymerization processes, and non-crosslinked polymers having enhanced thermal stability obtained using these non-crosslinking sucrose-based additives are provided.
    • 一种制备稳定的聚合物的方法,其表现出增强的热稳定性,其包括使混合物聚合,所述混合物包含:包含与在糖上优选长链(C3-C20)键合的伯和/或仲羟基的含烯丙基的单体 )含烯丙基的醚基团; 和一种或多种选自甲基丙烯酸酯单体,丙烯酸酯单体,丙烯酰胺单体和苯乙烯单体的单体,其足以产生显示出增强的热稳定性的聚合物。 作为新的稳定交联剂,使用包含与糖上的一级和/或二级羟基键合的含烯丙基的单体获得具有增强的热稳定性的聚合物。 此外,在聚合过程中使用非交联蔗糖基单体,优选在蔗糖的至少一个羟基上具有甲基,烷基或巴豆基醚的方法,并且使用具有增强的热稳定性的非交联聚合物 提供这些非交联的蔗糖基添加剂。
    • 3. 发明授权
    • Thermostable polymers from 1',2',3,3',4,4',6,6'-octa-O-allylsucrose
    • 1',2',3,3',4,4',6,6'-八-O-烯丙基蔗糖的热稳定聚合物
    • US5470931A
    • 1995-11-28
    • US199695
    • 1994-02-28
    • Navzer D. SachinvalaRedford F. JuMorton H. Litt
    • Navzer D. SachinvalaRedford F. JuMorton H. Litt
    • C07H15/04C08F216/12C08F216/14C08F220/30C08G59/32F02B75/02C08F224/00
    • C07H15/04C08F216/125C08F216/1416C08F220/30C08G59/32F02B2075/027
    • A method for producing stabilized polymers, exhibiting enhanced thermal stability, which comprises polymerizing a mixture comprising: a monomer comprising an allyl-containing group which is bonded to primary and/or secondary hydroxyl groups on a saccharide, preferably a long chain (C.sub.3 -C.sub.20) allyl-containing ether group on the hydroxyl group; and one or monomers selected from methacrylate ester monomers, acrylate ester monomers, acrylamide monomers and styrene monomers, in amounts sufficient to produce a polymer exhibiting enhanced thermal stability. Polymers having enhanced thermal stability are obtained using a monomer comprising an allyl-containing group which is bonded to primary and/or secondary hydroxyl groups on a saccharide, as a novel stabilization crosslinking agent. In addition, a method of using non-crosslinking sucrose-based monomers, preferably having a methyl, alkyl or crotyl ether on at least one of the hydroxyl groups of sucrose, in polymerization processes, and non-crosslinked polymers having enhanced thermal stability obtained using these non-crosslinking sucrose-based additives are provided.
    • 一种制备稳定的聚合物的方法,其表现出增强的热稳定性,其包括使混合物聚合,所述混合物包含:包含与在糖上优选长链(C3-C20)键合的伯和/或仲羟基的含烯丙基的单体 )含烯丙基的醚基团; 和选自甲基丙烯酸酯单体,丙烯酸酯单体,丙烯酰胺单体和苯乙烯单体中的一种或多种单体,其量足以产生表现出增强的热稳定性的聚合物。 作为新的稳定交联剂,使用包含与糖上的一级和/或二级羟基键合的含烯丙基的单体获得具有增强的热稳定性的聚合物。 此外,在聚合过程中使用非交联蔗糖基单体,优选在蔗糖的至少一个羟基上具有甲基,烷基或巴豆基醚的方法,并且使用具有增强的热稳定性的非交联聚合物 提供这些非交联的蔗糖基添加剂。
    • 4. 发明授权
    • Silicon carbide precursors
    • 碳化硅前体
    • US4777234A
    • 1988-10-11
    • US899680
    • 1986-08-25
    • Morton H. LittKanta Kumar
    • Morton H. LittKanta Kumar
    • C04B35/571C08G77/60C08G77/04
    • C04B35/571C08G77/60
    • The present application relates to novel silicon based preceramic polymers useful in the production of silicon carbide reinforcement fibers, and to the novel synthesis procedures by which such polymers and reinforcement fibers may be produced.These novel polymers are produced by preparing phenyl substituted polyalkylcyclohexasilane compounds, which are then converted to the corresponding halogen substituted compound by reaction with the appropriate ammonium halide and sulfuric acid in a suitable solvent such as benzene, and then polymerizing the substituted cyclohexasilane by reaction with an alkali metal, again in a suitable solvent such as toluene or benzene, to produce polymers of the general formula: ##STR1## wherein R.sub.1 is lower alkyl, preferably methyl or ethyl, R.sub.2 is lower alkyl or hydrogen, m is 0 to 5, n is at least 3. The polymers of the present invention have an average molecular weight of from about 1000 to 100 million or more.
    • 本申请涉及可用于生产碳化硅增强纤维的新型硅基预陶瓷聚合物以及可以生产这种聚合物和增强纤维的新型合成方法。 这些新型聚合物通过制备苯基取代的多烷基环己烷硅烷化合物制备,然后通过与适当的卤化铵和硫酸在合适的溶剂如苯中反应将其转化成相应的卤素取代的化合物,然后通过与 碱金属,再次在合适的溶剂如甲苯或苯中制备下列通式的聚合物:其中R1是低级烷基,优选甲基或乙基,R2是低级烷基或氢,m是0-5,n 至少为3.本发明的聚合物的平均分子量为约1000-10000或更高。