Tham khảo tài liệu 'modern plastics handbook 2011 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Elastomeric Materials and Processes - c - CH2 s - c -TNH - CHz 10 - cT- NH - CHJ - co -T CH2 y - oT o o L ojx o L Jz Hard Soft Hard Soft Where A c 9 to C21 dicarboxylic acid B - CHj - o -ftCHj - 0 j CHj 3 - Figure Structure of three PEBATPEs. Source Ref. 10 p. . service temperature. Polyesteramides retain tensile strength elongation and modulus to 347 F 175 C .1 Oxidative instability of the ether linkage develops at 347 F 175 C . The advantages of polyether block amide copolymers are their elastic memory which allows repeated strain deformation without significant loss of properties lower hysteresis good cold-weather properties hydrocarbon solvent resistance UV stabilization without discoloration and lot-to-lot The copolymers are used for waterproof breathable outerwear airconditioning hose underhood wire covering automotive bellows flexible keypads decorative watch faces rotationally molded basket- soccer- and volley balls and athletic footwear They are insert-molded over metal cores for nonslip handle covers for video cameras and coinjected with polycarbonate core for radio TV control Pebax polyether block amide copolymers consist of regular linear chains of rigid polyamide blocks and flexible polyether blocks. They are injection molded extruded blow molded thermoformed and rotational molded. The property profile is as follows specific gravity about Shore hardness range about 73 Ato 72 D water absorption flexural modulus range 2600 to 69 000 lb in2 to 474 MPa high torsional modulus from -40 to 0 C Izod impact strength notched no break from -40 to 68 F -40 to 20 C abrasion resistance long wear life elastic memory allowing repeated strain under severe conditions without permanent deformation lower hysteresis values than many thermoplastics and thermosets with equivalent hardness flexibility temperature range -40 to 178 F -40 to 81 C and flexibility temperature range is achieved without plasticizer it is .
