广东纺织职业技术学院：《纺织材料学》课程教学资源（PPT课件，英文版）5 Acetate and Triacetate Fibers

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Structure a Polymerization condensation eliminating a H,O molecule a Functional group; amide group Q Molecular configuration linear zigzag molecules forming well closely packed pleated sheets 口IMF:H-bond a Crystallinity High 65086%/ a CrOss-sectional and longitudinal shape: can be any thing

Structure  Polymerization: condensation, eliminating a H2O molecule  Functional group: amide group  Molecular configuration: linear zigzag molecules forming well closely packed pleated sheets  IMF: H-bond  Crystallinity: High 65~86%  Cross-sectional and longitudinal shape: can be any thing

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Properties a Tenacity: high due to high orientation and crystallinity Elongation high due to zigzag structure a Recovery: high due to zigzag d Energy of rupture high due to high tenacity and high elongation one of the toughest materials D Flexibility: high due to zigzag Q Abrasion resistance: high d Water absorption highest among all synthetic fibers

Properties  Tenacity: high due to high orientation and crystallinity  Elongation: high due to zigzag structure  Recovery: high due to zigzag  Energy of rupture: high due to high tenacity and high elongation: one of the toughest materials  Flexibility: high due to zigzag  Abrasion resistance: high  Water absorption: highest among all synthetic fibers

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Properties a Smooth round cross-section and uniformity permit close packing a Swells when absorbing moisture a Static: not enough water absorption Low specific gravity: 1. 14g/cc d Resilience: high: wrinkle free Can be laundered but not easy to clean a Vulnerable to degradation in acids D low resistance to sunlight 日 melts and drips

Properties  Smooth round cross-section and uniformity permit close packing  Swells when absorbing moisture  Static: not enough water absorption  Low specific gravity: 1.14g/cc  Resilience: high: wrinkle free  Can be laundered but not easy to clean  Vulnerable to degradation in acids  low resistance to sunlight  melts and drips