Process for post-spin finishing of polybenzoxazole fibers
    22.
    发明授权
    Process for post-spin finishing of polybenzoxazole fibers 失效
    聚苯并恶唑纤维的后纺整理工艺

    公开(公告)号:US5273703A

    公开(公告)日:1993-12-28

    申请号:US929272

    申请日:1992-08-13

    CPC分类号: D01F6/74

    摘要: Improved polybenzoxazole fibers are made by a process for finishing a spun and drawn dope fiber, which contains polybenzoxazole polymer and a solvent acid, including the steps of: (a) coagulating the dope fiber in an aqueous coagulant: (b) washing the coagulated fiber with an aqueous washing fluid for less than 72 hours under conditions such that the fiber contains no more than 8,000 ppm residual solvent acid (1 ppm=1 part per million, by weight); (c) drying the fiber at a temperature of no more than 300.degree. C. until it retains no more than about 2 weight percent residual moisture; and (d) heat-treating the fiber at a temperature of at least about 300.degree. C. under tension.

    摘要翻译: 改进的聚苯并恶唑纤维通过用于整理含有聚苯并恶唑聚合物和溶剂酸的纺丝和拉伸纺丝纤维的方法制备,包括以下步骤:(a)在水性凝结剂中凝结掺杂纤维:(b)洗涤凝固纤维 在含有不超过8,000ppm的残余溶剂酸(1ppm = 1重量份/百万重量份)的条件下,使用含水洗涤液小于72小时。 (c)在不超过300℃的温度下干燥纤维,直到其保持不超过约2重量%的残余水分; 和(d)在张力下在至少约300℃的温度下热处理纤维。

    Methods for synthesizing pulps and short fibers containing polybenzazole
polymers
    27.
    发明授权
    Methods for synthesizing pulps and short fibers containing polybenzazole polymers 失效
    用于合成聚氨酯聚合物的脉冲和短纤维的方法

    公开(公告)号:US5164131A

    公开(公告)日:1992-11-17

    申请号:US584813

    申请日:1990-09-19

    IPC分类号: D01F6/74 D21H13/10 D21H13/20

    CPC分类号: D01F6/74

    摘要: Pulps and short fibers containing polybenzoxazole and/or polybenzothiazole or copolymers thereof can be synthesized by freezing the wet fiber straight from the coagulation bath without drying, and chopping or grinding the frozen fiber to the desired size and degree of fibrillation.

    摘要翻译: 含有聚苯并恶唑和/或聚苯并噻唑或其共聚物的纸浆和短纤维可以通过将干燥的纤维从凝固浴中直接冷冻而不干燥,并将冷冻纤维切碎或研磨成所需尺寸和原纤维化程度来合成。

    Membranes containing microporous structure
    29.
    发明授权
    Membranes containing microporous structure 失效
    含微孔结构的膜

    公开(公告)号:US4775474A

    公开(公告)日:1988-10-04

    申请号:US936547

    申请日:1986-12-01

    IPC分类号: B01D67/00 C08J7/02 B01D13/00

    摘要: Asymmetric membranes are prepared by treating a major surface of a glassy polymer composition to render the surface resistant to solvent crazing and then contacting the glassy polymer composition with a crazing solvent. The crazing solvent permanently deforms the glassy polymer composition by forming a microporous structure on the untreated surface. The treated surface becomes the dense, discriminating layer of the membrane which achieves desirable permeation selectivity. The methods of treatment are (1) crosslinking, (2) providing an agent which renders the surface resistant to crazing, and (3) providing an agent which reacts with the surface. Additionally, the glassy polymer composition can be crosslinked before or after it is crazed to increase the mechanical strength of the membrane.

    摘要翻译: 通过处理玻璃状聚合物组合物的主表面以使表面耐溶剂裂纹,然后使玻璃状聚合物组合物与裂纹溶剂接触来制备不对称膜。 裂纹溶剂通过在未处理的表面上形成微孔结构而使玻璃状聚合物组合物永久变形。 经处理的表面变成膜的致密区分层,达到理想的渗透选择性。 处理方法是(1)交联,(2)提供使表面耐龟裂的试剂,和(3)提供与表面反应的试剂。 此外,玻璃状聚合物组合物可以在其被蠕动之前或之后交联以增加膜的机械强度。