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 Chapter 15 Acetate and Triacetate fibers

Chapter 15 Acetate and Triacetate Fibers

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Introduction a Fibers in which forming substance is cellulose acetate where not less than 929/ of hydroxyl groups are acetylated replacing-OH groups with -COCH3 D Acetate: 2 of 3-OH groups in each 6 member ring are acetylated; N2.5 a Triacetate: Nearly all -oh groups are replaced 2.91N296 a Major use: lining fabrics for suits coats draperies

Introduction  Fibers in which forming substance is cellulose acetate where not less than 92% of hydroxyl groups are acetylated: replacing -OH groups with -COCH3 .  Acetate: 2 of 3 -OH groups in each 6- member ring are acetylated; ~2.5  Triacetate: Nearly all -OH groups are replaced 2.91~2.96  Major use: lining fabrics for suits, coats, draperies

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Structures 口 Surface: straited d Cross-section: obed 口Skin- core structure 口DP:250-300 a Much less H-bond than in rayon

Structures  Surface: straited  Cross-section: lobed  Skin-core structure  DP: 250-300  Much less H-bond than in rayon

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Properties a Acetate: hydrophilic, thermoplastic a Triacetate: hydrophobic higher melting and softening temperature high crystallinity a Wrinkle easily in hot water: dry cleaning only a Swells in water, mechanical properties change in water d Resist to weak alkali and acids 口 Can be b| eached

Properties  Acetate: hydrophilic, thermoplastic  Triacetate: hydrophobic, higher melting and softening temperature, high crystallinity  Wrinkle easily in hot water: dry cleaning only  Swells in water, mechanical properties change in water  Resist to weak alkali and acids  Can be bleached

广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Properties 口So|ub| e in acetone a Degrade in uv light a Burns, melts forms black beads with vinegar like odder

Properties  Soluble in acetone  Degrade in UV light  Burns, melts, forms black beads with vinegar like odder