交替共聚脲是通过 1,4-哌嗪二羰基氯与六亚甲基二胺的界面缩聚反应制备的。这种交替共聚脲与相应的具有无规分布的共聚脲的比较表明,交替共聚物具有更高的熔点、更大的结晶度,并且比无规共聚物的溶解性稍差。通过 2,5-二甲基哌嗪与对苯二甲酰氯和亚乙基双(氯甲酸酯)的界面缩聚反应制备了一系列共聚酰胺氨基甲酸酯,使用两种二酰氯的各种加成方式。这些共聚酰胺-氨基甲酸酯的有序度是根据可能的反应机理推测的。共聚物的定向“结晶度”或晶格顺序,由 X 射线衍射图确定,
POLYETHYLENE COMPOSITIONS WITH IMPROVED OPTICAL PROPERTIES
申请人:Dow Global Technologies LLC
公开号:US20180022894A1
公开(公告)日:2018-01-25
Embodiments of a polyethylene composition comprise at least 50% by wt. of at least one polyethylene polymer; and 0.001 to 2% by wt. of bisamide nucleating agent utilized to reduce haze within the polyethylene composition.
A POLYLACTIC ACID STEREOCOMPLEX COMPOSITION, ITS MOLDED PRODUCT, A PROCESS FOR ITS MANUFACTURE AND ITS APPLICATION
申请人:INSTITUTE OF CHEMISTRY ACADEMY OF SCIENCES
公开号:US20160272811A1
公开(公告)日:2016-09-22
The instant invention discloses a polylactic acid stereocomplex composition containing pure stereocomplex crystals and a process for its manufacture. The composition according to this invention comprising (a) 30-70 wt % poly (L-lactic acid) (PLLA). (b) 70-30 wt % poly (D-lactic acid) (PDLA) and (c) 0.01-10 wt % nucleating agent, which can be obtained by solution and melt blending. Stereocomplex crystals are preferentially formed according to the invention, and the homocrystals (a crystal form) for the PLLA or PDLA homopolymer can't be observed. The melting temperature of the composition according to the invention is at least 200° C., which is about 30-50° C. higher than the PLLA or PDLA homopolymer.
Crystalline polypropylene resin composition and amide compounds
申请人:NEW JAPAN CHEMICAL CO.,LTD.
公开号:EP0557721A2
公开(公告)日:1993-09-01
Disclosed are a crystalline polypropylene resin composition comprising a crystalline polyproplylene resin and a β-nucleating agent, and a method of increasing the proportion of β-form crystals in a crystalline polypropylene resin molding comprising molding the composition, the β-nucleating agent being a diamide compound.