Polycarbonate Blends

Polycarbonate Blends

Chapter 28 Polycarbonate Blends Category: Thermoplastic alloys. General Description: Polycarbonate (PC) is frequently blended with polyesters (polyet...

77KB Sizes 46 Downloads 232 Views

Chapter 28

Polycarbonate Blends Category: Thermoplastic alloys. General Description: Polycarbonate (PC) is frequently blended with polyesters (polyethylene terephthalate and polybutylene terephthalate) and styrenics (acrylonitrile-butadiene-styrene (ABS) and acrylonitrile-styrene-acrylate) to modify its properties for a great variety of end uses.[87] GE Plastics Cycoloy® resins are amorphous PC/ABS blends.

Weathering Properties: Stabilization Tinuvin® 234 protects PC blends from the discoloration associated with exposure to UV light. As shown in Graph 28-3, it takes much longer for the sample containing Tinuvin® 234 to reach the same level of discoloration as the control sample.[87]

Weathering Properties Cycoloy® resins exhibit excellent UV stability. Slight color change and loss of mechanical properties can result after long-term exposure.[94]

Weathering Properties by Material Supplier Trade Name Graph 28-1. Color Change, E, of Pigmented GE Plastics Cycoloy® C1100 PC/ABS after Accelerated UV Exposure as per SAE J1885 (ATLAS Ci65XW) and DIN75202 (XENON450).[94] 8 Ultramarine Blue SAE J1885 DIN75202

7 6

Medium Gray SAE J1885 DIN75202

ΔE

5 4

Dark Gray SAE J1885 DIN75202

3 2 1 0 0

50

100

150

200

Exposure Time (hrs)

250

300

160

The Effects of UV Light and Weather on Plastics and Elastomers

Graph 28-2. Color Change, E, of Pigmented GE Plastics Cycoloy® C1100 PC/ABS after Accelerated UV Exposure as per SAE J1885 (ATLAS Ci65XW) and DIN75202 (XENON450).[94]

Color Change (ΔE or gray scale)

8 Black/gray scale SAE J1960 DIN53387

7 6

Black/ΔE SAE J1960 DIN53387

5 4 3 2 1 0

400

0

800

1200

1600

Exposure Time (hrs)

Graph 28-3. Color Development after Xenon Arc Weatherometer Exposure of PC/ABS (50/50) Blend with Tinuvin® 234 UV Stabilizer.[87] Xenon Arc Weathering, ISO 4892-2, Cycle 102/18

Control

+ 0.5% Tinuvin 234

0

500

1000

Exposure Time to ΔYI = 5 (hrs)

1500