U polymer

U-100 (Neat Polymer)

Technical Data

Properties of U-100

(1) Heat resistance

Even if not reinforced, U-100 has a high deflection temperature under load (175°C under a load of 1.8 MPa = 18.6 kg/cm2). U-100 has a main glass transition point of 200°C or more and a sub transition point at around -50°C. The glass transition at around 200°C is due to thermal movement of main chains, indicating that U-100 is highly heat-resistant. The U-100 resin retains its shape at a temperature under the glass transition temperature. On the other hand, the sub transition point at around -50°C is due to local movement of molecules, indicating energy absorption at low temperature. Accordingly, U-100 has a high toughness consistently throughout a wide range of temperature including the low temperature range. As an example, the relationship between the Izod impact strength and the temperature is shown below.

Relationships between the dynamic viscoelasticity and Izod impact strength of U-100 resin and the temperature

Heat resistance of various plastics

(2) Transparency and Optical Properties

U polymer has a transparency as high as that of PC or PMMA, and transmits light at a rate of up to 90%. In addition, the refractive index of U polymer is very high at 1.610 (wavelength 589 nm, 23°C).

Transparency of various plastics

(3) Mechanical Properties

The U-100 resin may be used at a wide range of temperature from low to high temperature, as it has high modulus and strength in the wide temperature range. The resin has high deflection temperature under load, and thus exhibits great creep resistance at high temperature. It is also excellent in dimensional accuracy during molding.

• Tensile creep of U-100, load:9.8Mpa{100kg/cm2}

  

(4) Elastic recovery

U polymer exhibits excellent elastic recovery. It has a high allowable strain ratio, and thus may be used as springs in a wider range of length. U polymer is also excellent in creep properties and retains the properties as spring for an extended period of time.
(The allowable strain is the maximum strain. Make sure to decide a practically allowable strain by multiplying the allowable strain by a safety factor in practical use.)

Allowable strain ratio of U-polymer

(5) UV-blocking property

U polymer has UV-blocking property. U polymer blocks light at a wavelength of 350 nm or less, immediately after molding.
In contrast, it transmits almost 90% light at a wavelength of 400 nm or more.
In addition, it is possible to increase the UV-blocking property by UV irradiation, and consequently to block light completely at a wavelength of 400 nm or less, i.e., almost all UV light.

UV-blocking property of various transparent materials

(6) Weather Resistance

Without addition of any additives for improving weather resistance, U polymer exhibits excellent weather resistance.
It is because UV irradiation increases the UV-blocking property.

Weather resistance of various transparent materials (change in tensile breaking elongation)

Weather Resistance of various transparent materials [Change in haze (cloudiness)]