Liquid crystal naphthalene compounds, represented by the following formula (1) are disclosed.
R-Z-A-#-NAP-Z′-R′ (1)
In the formula (1), R is an alkyl group containing 1 to 18 carbon atoms; R′ is an alkyl group containing 1 to 21 carbon atoms; NAP represents 2,6-naphthylene group;# represents C≡C;
A, Z and Z′ are as follows: 1) A is Pyr> and
(a) Z is - and Z′ is O or COO or (b) Z is OCO and Z′ is - or O; 2) A is FPhF and (a) Z is - or O and Z′ is -, O or COO or (b) Z is OCO and Z′ is - or O; 3) A is FPh and (a) Z is - and Z′ is O or COO, (b) Z is O and Z′ is -, O or COO or (c) Z is OCO and Z′ is - or O; 4) A is
揭示了液晶
萘化合物,其表示为以下公式(1):R-Z-A-#-NAP-Z′-R′ (1)
在公式(1)中,R是含有1至18个碳原子的烷基基团;R′是含有1至21个碳原子的烷基基团;NAP代表2,6-
萘基团;#代表C≡C;A,Z和Z′如下:
1)A是Pyr>,并且(a)Z是-,Z′是O或COO,或者(b)Z是OCO,Z′是-或O;
2)A是FPhF,并且(a)Z是-或O,Z′是-,O或COO,或者(b)Z是OCO,Z′是-或O;
3)A是FPh,并且(a)Z是-,Z′是O或COO,或者(b)Z是O,Z′是-,O或COO,或者(c)Z是OCO,Z′是-或O;
4)A是
Catalyst for Olefin Polymerization and Preparation Thereof and Polymerization Process
申请人:Wang Licai
公开号:US20080161513A1
公开(公告)日:2008-07-03
The catalyst for olefin polymerization contains three components A, B and C. The component A is a solid catalyst containing titanium, magnesium, chlorine element and an internal electron donor, the internal electron donor consists of 1,4-diether [2,2′-dialkoxy-1,1′-biphenyl, 2,2′-dialkoxy-1,1′-binaphthalene, 10,10′-dialkoxy-9,9-biphenanthrene] and organic acid ester or 1,3-diether [9,9-bis(methoxymethyl)fluorine, 2,2-dialky 1-1,3-dimethoxypropane]; the component B is an organoaluminum compound; the component C is external electron donor-organic silicon compound or the 1,4 aromatic diether. The catalyst has high catalytic activity, and can be adjusted in the range from 40,000 to 150,000 gPP/gCat when used in propylene polymerization. The polymer made therefrom has isotactivity of 80 to 99 percent and the molecular weight distribution can be adjusted in a wide range. The invention provides a novel method for preparing the 1,4 aromatic diether.
烯烃聚合反应的催化剂包含三个组分A、B和C。组分A是一种固体催化剂,包含
钛、
镁、
氯元素和内部电子给体。内部电子给体由1,4-
二醚[2,2'-二烷氧基-1,1'-
联苯、2,2'-二烷氧基-
1,1'-联萘、10,10'-二烷氧基-9,9-
联苯并]和有机酸酯或1,3-
二醚[9,9-双(甲氧基甲基)
氟、2,2-二烷基-
1,3-二甲氧基丙烷]组成;组分B是一种
有机铝化合物;组分C是外部电子给体-
有机硅化合物或1,4-芳香
二醚。该催化剂具有高催化活性,在
丙烯聚合中使用时,可以在40,000至150,000 gPP/gCat的范围内调整。由此制成的聚合物具有80至99%的同构活性,分子量分布范围可以广泛调整。本发明提供了一种制备1,4-芳香
二醚的新方法。
Room temperature photochromic liquid crystal [3H]-naphtho[2,1-b]pyrans—photochromism in the mesomorphic state
作者:Michel Frigoli、Georg H. Mehl
DOI:10.1039/b407561g
日期:——
Photochromic liquid crystals based on [2H]-chromenes functionalised in the 3,3â²-positions by phenyl groups linked to 4-cyano-4â²-hydroxybiphenyl groups via alkyl and siloxane spacers as chromophore were synthesised and the photochromic and mesomorphic behaviour was investigated.
研究人员合成了基于[2H]-
铬烯的光致变色液晶,该
铬烯通过烷基和
硅氧烷间隔物作为发色团,在 3,3â²-位由与 4-
氰基-4â²-羟基
联苯基团相连的苯基官能化,并研究了其光致变色和介形行为。
Buu-Hoi; Hoan; Jacquignon, Recueil des Travaux Chimiques des Pays-Bas, 1949, vol. 68, p. 781,785
作者:Buu-Hoi、Hoan、Jacquignon
DOI:——
日期:——
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