chap7 thermal, optical and electrical properties of fiber
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chap7 Thermal, Optical and electrical properties of fiber. 7.1 Thermal properties of fiber 7.2 Optical properties of fiber 7.3 Electrical properties of fiber. Textile Materials. chap7 Thermal, Optical and electrical properties of fiber. - PowerPoint PPT PresentationTRANSCRIPT
chap7 Thermal, Optical and electrical properties of fiber
7.1 Thermal properties of fiber
7.2 Optical properties of fiber
7.3 Electrical properties of fiber
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-1 relation between fiber specific heat, fiber moisture regain and temperature
0. 5
1
1. 5
2
2. 5
3
0 10 20 30 40(%)回潮率
(J/g
·℃
)比热
80℃
40℃ 20℃
0℃
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-2 DSC graphics of differently orientated polyethylene fibers
dH/dt
(J.s-1)
1270
1350
H=175J/g
H=202J/g
80 100 120 140 160
T/℃
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-3 changing regular pattern of specific heat of two kinds of polyester with temperature
0. 40. 60. 8
11. 21. 41. 61. 8
22. 2
0 40 80 120 160 200 240
(℃)温度
(J/g·
℃)
比热 系
1列系
2列
淬火 PET
退火 PET
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-4 heat transmission diagram
Q
d
T1 T2 (T2 T1)
S
λ
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-5 relation between fiber layer volume weight and heat conductivity
0 0. 05 0. 1 0. 15 0. 2 0. 25
(δ )体积重量
λ导热系数
两端压差大
两端无压差
静止空气
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-6 relation between direction αf of fiber arrangement and heat conductivity
0. 125
0. 15
0. 175
0. 2
0. 225
0. 25
0. 275
0 10 20 30 40 50 60 70 80 90
纤维排列方向角αf (° )
热传导能力
αf热辐射方向
纤维层方向
导热系
数
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-7 mechanical properties of non-crystalline materials
温度
形变
玻璃态高弹态
粘流态玻璃化转变区
粘弹转变区
交联型分子
Tg(℃) Tf(℃)
(a)
温度
lgE
Tg(℃)Tf(℃)
交联型分子
玻璃态
高弹态 粘流态
玻璃化转变区
粘弹转变区
(b)
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-8 maintenance ratio of mechanical properties of POB fiber
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-9 thermogravimetry curve of high- intensity high-modulus polyethylene
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-10 thermal shrinkage of synthetic fibers
收缩率
(%)
0 2 4 6 8
10 12 14 16
PA6 PA66 PET 纤维品种
沸水 饱和蒸汽 热空气
图 7-10 合成纤维的热收缩率
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-11 effects of layered reflection and refraction on luster
入射 主反射 次反射
次透射主透射
介质 1(空气或液体 )
介质 1(空气或液体 )
介质 2(纤维 )
2
2
1
1
(a) 层状结构
i r
t
t2
t3
tr
tr2
trt
t2r
tr
(c) 纤维集合体
入射
反射 1反射 3
折射 2
折射 1
折射 3
反射 2
(b)纤维
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-12 layered reflection and refraction diagram
入射 反射 1 2 3 4
空气
层 1
层 2
层 3
层…
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-13 decomposition and birefringence of plane polarized light
光入射
平面偏振光
纤维
E⊥
E
θ
纤维轴
δ
E
e光 V∥
o光 V⊥
滞后 δ椭圆偏振
E∥
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-14 maintenance ratio of mechanical properties of POB after illumination
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-15 relation between mass specific resistance and R.H.
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-16 relation between mass specific resistance and temperature
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-17 relation between dielectric constant and moisture content
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-18 effects of frequency on dielectric constant of fiber
chap7 Thermal, Optical and electrical properties of fiber
Picture 7-19 static charge generating sequence
εr 大 εr小
高 (+) ( - )低
聚氨酯
聚酰胺66
羊毛
蚕丝
粘胶纤维
皮肤
棉纤维
醋酯纤维
聚甲基丙烯酸甲酯
聚乙烯醇缩甲醛
聚对苯二甲酸乙二酯
聚丙烯腈
聚氯乙烯
聚碳酸酯
聚氯醚
聚偏三氯乙烯
聚苯醚
聚苯乙烯
聚乙烯
聚丙烯
聚四氟乙烯