Main chain PLCs from discotic cores Side chain plcs Spacer Spacer Lyotropic LCP Nomex Lyotropic LCP Kevl HOOC- NH.+ CIOC NHOC Lyotropic LCE 2-phase regime SE images of fractured fibers shows the long fibrils in n aramid fiber (a) and the shorter, more sheet-lil 0.00.51.01.52.02.5 fibrils(b-c) in these Vectran fibers
11 Main chain PLCs from discotic cores Spacer Side chain PLCs Spacer Nomex Poly(m-phenyleneisophthalamide H2N− −NH2 + HOOC− −COOH ∼∼HN− −NHOC− −CO ∼∼ Lyotropic LCP Kevlar H －COCl 2N－ －NH2 + ClOC － ∼∼HN－ －NHOC－ －CO ∼∼ Lyotropic LCP 2-phase regime Nematic η η* Φ Φ* 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 isotropic Lyotropic LCP SE images of fractured fibers shows the long fibrils in an aramid fiber (a) and the shorter, more sheet-like fibrils (b-c) in these Vectran fibers a b c
Thermotropic LCP Aromatic copolyester Thermotropic LCP Aromatic copolyester Vectra Xydar Hoechst Celanese Corporation Darco ng, and Nippon Petrochemica IBA HNA HBA HBA: hydroxy benzoic acid; TA: terephthalic acid; HBA: hydroxy benzoic acid; HNA: hydroxy napthoic acid BP: biphenol; IA: isophthalic acid Thermotropic LCP Aromatic copolyester Family Characteristics X7G and wH precisi Eastman Kodak Company olerances, easy flow for thin-wall parts, low mold 0-CH CH -O Inherent resistance to burning low smoke generation Excellent chemical resistance HBA: hydroxy benzoic acid; TA terephthalic acid, EG Exceptional strength, stiffness, and toughness Properties of aromatic copolyesters 324热固性塑料 VectraAl30 Spenic gravity, g/em Water ahtorption%o <0.04 热固性塑料 Tensile strength. MPa 16 酚醛树脂不饱和聚酯脲醛树脂蜜胺树脂聚氨酯 Tensile elongation, % Notched Izod. J/m 聚酰亚胺
12 HBA: hydroxy benzoic acid; HNA: hydroxy napthoic acid Vectra Hoechst Celanese Corporation C O O C O O x y HBA HNA Thermotropic LCP Aromatic copolyeste C HBA C TA O O O C O O O C IA O C O BP HBA: hydroxy benzoic acid; TA: terephthalic acid; BP: biphenol; IA: isophthalic acid Dartco Manufacturing, and Nippon Petrochemical Xydar Thermotropic LCP Aromatic copolyeste C O O CH2CH2 O n HBA C O n TA C n O O O EG HBA: hydroxy benzoic acid; TA: terephthalic acid; EG: ethylene glycol Eastman Kodak Company X7G and WH Thermotropic LCP Aromatic copolyeste Family Characteristics Easy precision moldability, in terms of repeatability, tight tolerances, easy flow for thin-wall parts, low mold shrinkage, and fast cycles Exceptional strength, stiffness, and toughness Excellent chemical resistance Inherent resistance to burning low smoke generation Minimal change of dimensions with exposure to high temperatures Properties VectraAl30 Xydar RC210 Spenfic gravity, g/cm3 1.6 1.6 Water ahtorption, % <0.04 <0.1 Tensile strength, MPa 180 140 Tensile modulus, GPa 15 16 Tensile elongation, % 2.3 1.7 Notched Izod, J/m 110 110 Heat-deflection T, at 18 MPa, °C 230 346 Oxygen index, % 37 46 Properties of aromatic copolyesters 3.2.4 热固性塑料 酚醛树脂 不饱和聚酯 脲醛树脂 蜜胺树脂 聚氨酯 热固性塑料 聚酰亚胺