专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5071917A High strength fibers of stereoregular polystrene 失效
标题翻译：立体定向聚苯乙烯的高强度纤维
公开(公告)号：US5071917A
公开(公告)日：1991-12-10
申请号：US569492
申请日：1990-08-20
申请人： David R. Pederson , Peter E. Pierini , Henry N. Beck , Mark J. Semer
发明人： David R. Pederson , Peter E. Pierini , Henry N. Beck , Mark J. Semer
IPC分类号： D01F6/22
CPC分类号： D01F6/22
摘要： The invention is a crystalline fiber comprising syndiotactic polystyrene, or a mixture. Preferably the fiber is a high strength fiber isotactic polystyrene and syndiotactic polystyrene wherein the fiber is monoaxially oriented, has a tensile strength of about 10,000 psi or greater, and a modulus of about 1,000,000 psi or greater.In another aspect the invention is a process for the preparation of fibers of syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene which comprises:A. contacting syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene with a solvent for the polystyrene at elevated temperatures under conditions such that a homogenous solution is formed which has sufficient viscosity to be extruded;B. extruding the solution through an orifice to form a fiber at elevated temperatures;C. quenching the fiber by passing the fiber through one or more zones under conditions such that the fiber solidifies;D. removing the solvent for the polystyrene from the fiber; andE. cooling the fiber to ambient temperature.In the embodiment where it is desirable to prepare high strength fibers, the fibers are further exposed to the following process steps:F. heating the fiber to a temperature above the glass transition temperature of the polystyrene;G. redrawing the fiber to elongate the fiber, maximize crystallinity, and induce monoaxial orientation of the polystyrene in the fiber.
摘要翻译：本发明是包含间同立构聚苯乙烯或混合物的结晶纤维。优选地，纤维是高强度纤维全同立构聚苯乙烯和间同立构聚苯乙烯，其中纤维是单轴取向的，具有约10,000psi或更大的拉伸强度和约1,000,000psi或更大的模量。另一方面，本发明是制备间同立构聚苯乙烯纤维或全同立构聚苯乙烯与间同立构聚苯乙烯的混合物的方法，其包括：A.将间同立构聚苯乙烯或全同立构聚苯乙烯与间同立构聚苯乙烯的混合物与聚苯乙烯溶剂在升高的温度下，在形成具有足够的待挤出粘度的均匀溶液的条件下， B.通过孔口挤出溶液以在升高的温度下形成纤维; C.通过在纤维固化的条件下使纤维通过一个或多个区域淬火纤维; D.从纤维中去除聚苯乙烯的溶剂; 和E.将纤维冷却至环境温度。在需要制备高强度纤维的实施方案中，纤维进一步暴露于以下工艺步骤：F.将纤维加热到高于聚苯乙烯的玻璃化转变温度的温度; G.重新拉伸纤维以拉长纤维，使结晶度最大化，并诱导纤维中聚苯乙烯的单轴取向。

IPRDB

热门服务

关于我们

友情链接

联系方式