Celanese Vectra

Four companies (trade name in parentheses), Amoco (Xydar), Hoechst-Celanese (Vectra), Du Pont, and Granmont (Granlar), make thermotropic LCPs for various types of extmsion and mol ding processes. Six companies have discontinued TCP materials that were either commercial or under development. These companies include ICl, BASF, Eastman, Bayer, General Electric, and Monsanto. 

As an example, the structure of Celanese Vectra A950 LCP is shown in Figure 4.107. 

Figure 4.108 Stress vs. strain at various temperatures for Celanese Vectra A130—30% glass fiber reinforced, standard grade LCP.

Figure 4.114 Stress vs. strain at 23°C for several Celanese Vectra L130—30% glass fiber reinforced, high flow LCPs.

Figure 4.116 Influence of temperature on tensile stress-strain behavior of Celanese Vectra B230 LCP [9].

Figure 4.119 Shear modulus vs. temperature for various Celanese Vectra LCPs.

Figure 4.120 Tensile modulus vs. temperature for Celanese Vectra LCP [9],...

Three commercially available thermotropic liquid crystalline polymers (TLCPs) were presented as examples in this section. They are Hoechst Celanese Vectra A950 and Vectra B950 as well as Amoco Xydar . Vectra A950 is a random copolymer of 73 mol% 4-hydroxybenzoic acid and 27 mol% 6-hydroxy-2-naphthoic acid, and Vectra B950 is a random copolyesteramide consisting of 60 mol% of 6-hydroxy-2-naphthoic acid, 20 mol% terephthalic acid, and 20 mol% p-aminophenol. Xydar is made from p-hydroxybenzoic acid, isophthalic and/or terephthalic acids, and 4,4 -biphenol. The repeating unit structures of the three LCPs are shown in Figure 6.2. 

Figure 6.74 Flexural stress amplitude versus cycles to failure at 23°C of two Celanese Vectra fiber-reinforced LCP plastics (10 Hz) [19].

Figure 6.76 Dynamic coefficient of friction for various Celanese Vectra LCP resins (P = 6 N, v = 60 cm/min) [19].

Table 6.24 Coefficients of Friction for Various Celanese Vectra LCP Grades [19]...

---