Chap7 Thermal, Optical and electrical properties of fiber 7.1 Thermal properties of fiber 7.2...

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


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℃


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/℃


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


Picture 7-4 heat transmission diagram

Q

d

T1 T2 (T2 T1)

S

λ


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


Picture 7-6 relation between direction αf of fiber arrangement and heat conductivity

0. 1250. 15

0. 1750. 2

0. 2250. 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


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)


Picture 7-8 maintenance ratio of mechanical properties of POB fiber


Picture 7-9 thermogravimetry curve of high- intensity high-modulus polyethylene


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


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


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…


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∥


Picture 7-14 maintenance ratio of mechanical properties of POB after illumination


Picture 7-15 relation between mass specific resistance and R.H.


Picture 7-16 relation between mass specific resistance and temperature


Picture 7-17 relation between dielectric constant and moisture content


Picture 7-18 effects of frequency on dielectric constant 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

Chap7 Thermal, Optical and electrical properties of fiber 7.1 Thermal properties of fiber 7.2...

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