Synthesis and characterization of thermotropic liquid crystalline poly(aryl ether ketone) copolymers with pendant 3‐(trifluoromethyl) phenyl groups

Wang, Guibin; Jiang, Zhenhua; Zhang, Shuling; Chen, Chunhai; Wang, Zhongwen

doi:10.1002/pi.2001

Cited by 18 publications

(22 citation statements)

References 14 publications

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“…24 According to Wang's results, the effect of geometric repulsive factors on the thermodynamic stability of the mesophase was much larger than that of polarizability attractive factors. 22,[25][26][27] This indicated that the introduction of bulky, twisted and non-coplanar phthalazinone structure into the mainchain would destabilize the liquid crystalline phase. Consequently, the value of ÁT (40 C) was lower than that of other thermotropic liquid crystalline PAEK copolymers (> 50 C).…”

Section: Dsc Analysismentioning

confidence: 99%

“…In Figure 3(b), the liquid crystalline sample exhibited only one small diffraction halo at 2 ¼ 22 which suggested the crystal structure was destroyed and shortdistance order (< 2 nm) in the main chain was formed. 22 Compared with a and b, no evident diffraction peak could be detected in Figure 3(c) indicated that the crystal structure was completely destroyed and an amorphous pattern was shaped.…”

mentioning

confidence: 94%

“…[17][18][19][20][21][22] Quite recently, a novel kind of lyotropic liquid crystalline poly(aryl ether ketones) copolymer and several kinds of polyamides containging phthalazione structure which possessed nematic lyotropic liquid crystalline properties were firstly described in our works. [9][10][11]13 In the present paper, a novel kind of nematic thermotropic liquid crysatlline poly(aryl ether ketones) copolymer was prepared by a one-step mild solution polycondensation reaction with 4-(4-hydroxyl-phenyl)(2H)-phthalazin-1-one (DHPZ), 4, 4 0 -biphenol (BP) and 1, 4-bis(4-fluorobenzoyl)-benzene (BFBB).…”

mentioning

confidence: 97%

“…26 And it was also noteworthy that the formation conditions of thermotropic liquid crystalline texture for P-5050 was a little different from other thermotropic liquid crystalline poly(aryl ehter ketones) copolymers was due to the fact that a phthalazinone structure (bulky, twisted and non-coplanar configureation in steric) in the mainchains would hinder the movement and cubmer the regular packing of the mainchanis significantly. 9,12,22 SAXD and WAXD Analysis…”

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confidence: 99%

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Synthesis and Thermotropic Liquid Crystalline Behavior of Novel Main-Chain Poly(aryl ether ketones) Copolymer Containing Phthalazinone Moiety and Biphenyl Mesogen

Sun

Wang

Jin

et al. 2007

Polym J

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A novel thermotropic liquid crystalline poly(aryl ether ketones) copolymer containing phthalazinone moiety and biphenyl mesogen named P-5050 was developed by a mild solution polycondensation reaction. The thermotropic liquid crystalline properties were characterized by the means of differential scanning calorimetry (DSC), polarized light microscopy (PLM) and wide-angel X-ray diffraction (WAXD). A thread-like texture was achieved when P-5050 was annealed at 320 C for 1 h, and a typical schlieren texture was observed when shear forces were induced at that temperature. The crystalline-to-liquid crystalline transition (T m ) and the liquid crystalline-to-isotropic phase transition (T i ) appeared in both the first cooling and second heating DSC thermograms. The glass transition temperature (T g ) was 160C and the value for 5% weight loss temperature was 510 C in nitrogen from DSC and TGA determinations, respectively. 2-13It is well-known that liquid crystalline properties are particularly valuable in the applications of high performance engineering materials. For example, the melt viscosities of thermotropic liquid crystalline polymers (LCPs) possessing an isotropic melt state were significantly lower than structurally similar polymers. [14][15][16] In addition, LCPs were also attached importance to their high modulus and a very low thermal expansion in their direction of the macroscopic orientation.A series of thermotropic liquid crystalline poly(aryl ether ketones) copolymers have been prepared since Bennett and Farris firstly reported a kind of thermotropic liquid crystalline poly(aryl ether ketones) copolymers based on 4, 4 0 -biphenol, bulky substituted hydroquinone and 4, 4 0 -difluorobenzophenone in 1994.

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Section: Dsc Analysismentioning

confidence: 99%

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confidence: 94%

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confidence: 97%

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confidence: 99%

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Synthesis and Thermotropic Liquid Crystalline Behavior of Novel Main-Chain Poly(aryl ether ketones) Copolymer Containing Phthalazinone Moiety and Biphenyl Mesogen

Sun

Wang

Jin

et al. 2007

Polym J

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“…Along with this trend, the synthetic approach also shifted to the preparation of substituted aromatic poly(ether ketone)s, especially those bearing perfluoroalkyl groups, [46][47][48][49] and aromatic copoly(ether ketone)s having naphthylene moieties 50,51 or additional functional groups. 52 Application of aromatic poly(ether ketone)s as high-performed coating material is one of the main usages of this type of polymer.…”

Section: O N Aromatic Ringmentioning

confidence: 99%

Synthesis of Wholly Aromatic Polyketones

Yonezawa

Okamoto

2009

Polym. J.

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The structural design strategy and the synthetic approaches for the wholly aromatic polyketones and the monomers are described. Electrophilic aromatic aroylation substitution polycondensation and aromatic coupling polycondensation have been investigated as synthetic routes for wholly aromatic polyketones by the author's group. Acyl-acceptant arene molecules as the electrophilic aromatic aroylation substitution polycondensation type monomers and the aromatic nuclei for bis(chlorobenzoylated) compounds as the aromatic coupling polycondensation one were designed and synthesized employing 2,2 0 -dioxybiphenyl, 2,2 0 -dioxy-1,1-binaphtyl, and o-terphenyl skeletons. Determining factors for monomers, which enable regioselective polycondensation, are also discussed. The properties of polyketones are also discussed briefly on the basis of polymer repeating unit structures. Aromatic polyketones are a group of aromatic polymers having ketonic carbonyl groups as the major linkage in the aromatic polymer main chain. Though there have been reported many examples of aromatic polyketones, almost all of them belong to the category of ''aromatic poly(ether ketone)s.'' [1][2][3][4][5] In fact, the term ''aromatic polyketone'' is generally apt to be regarded identical to ''aromatic poly(ether ketone).'' As a representative material of this category of aromatic polymer, PEEK Ò (1), a poly(ether ether ketone), is well-known super engineering plastics showing superior thermal stability, mechanical strength, and chemical resistance. Figure 1 shows the structure of PEEK Ò (1). The repeating unit of the polymer is composed of three 1,4-phenylene moieties bonded with two ether linkages and one ketonic carbonyl group. The structure suggests that PEEK Ò (1) might have properties more attributable to aromatic ether rather than aromatic ketone.On the other hand, aromatic polymers that have main chain structure composed of only aromatic rings and ketonic carbonyl groups are another type of aromatic polyketones (Figure 2). 6 The authors' group has been investigating the synthesis of aromatic polyketones free from main chain hetero linkages, wholly aromatic polyketones, during recent one and a half decades. Contrary to aromatic poly(ether ketone)s, wholly aromatic polyketones were seldom reported before.Prior to discussion of synthetic chemistry of wholly aromatic polyketones, the overview of aromatic polyketones including aromatic poly(ether ketone)s is briefly summarized to discriminate between aromatic poly(ether ketone)s and wholly aromatic polyketones.Aromatic polyketones are obliged to have copolymer structure composed of aromatic rings and ketonic carbonyl groups. From this point, aromatic polyketones are regarded as polyarylenes bearing inserted carbonyl groups. These polymers are classified into wholly aromatic polyketones or others according to the absence or presence of hetero linkages in the main chain. Aromatic poly(ether ketone) is the representative polymer of the latter type.As a natural consequence of the structural characterist...

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Synthesis and Characterization of Poly (aryl ether ketone) Copolymers

G¹

2011

High Performance Polymers and Engineering Plastics

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Synthesis and characterization of thermotropic liquid crystalline poly(aryl ether ketone) copolymers with pendant 3‐(trifluoromethyl) phenyl groups

Cited by 18 publications

References 14 publications

Synthesis and Thermotropic Liquid Crystalline Behavior of Novel Main-Chain Poly(aryl ether ketones) Copolymer Containing Phthalazinone Moiety and Biphenyl Mesogen

Synthesis and Thermotropic Liquid Crystalline Behavior of Novel Main-Chain Poly(aryl ether ketones) Copolymer Containing Phthalazinone Moiety and Biphenyl Mesogen

Synthesis of Wholly Aromatic Polyketones

Synthesis and Characterization of Poly (aryl ether ketone) Copolymers

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