English | عربي

Navigation

News

Astra Polymers Sales & Service Excellence

Read more

Astra Polymers is pleased to announce the signing of Reach Compliance Agreement with B-Lands Consulting, Grenoble - France

Read more

The 10th Annual GPCA Forum - Dubai 2015

Read more

Astra Polymers Technical Seminar - Amman, Jordan 19th January 2015.

Read more

Arabplast - Dubai 2015

Read more

PLASCON GPCA - Sharjah 2014

Read more

Saudi Plastics & Petrochem - Riyadh 2014

Read more

Plasti & Pack Pakistan - Lahore 2013

Read more

GPCA PlastCon - Dubai 2013

Read more

BASF Middle East and Astra Polymers reinforce cooperation

Read more

Astra Polymers pleased to announce our new manufacturing Plant in Rabigh .

Read more

Astra Polymers go live with globalized SAP system.

Read more

Astra Polymers India Project.

Read more

Saudi Print & Pack - Riyadh 2011

Read more

Thermoplastic Vs Thermosetting Polymers

Most of the polymers described in 'polymer application area' are classified as thermoplastic. This reflects the fact that above Tg they may be shaped or pressed into molds, spun or cast from melts or dissolved in suitable solvents for later fashioning. Because of their high melting point and poor solubility in most solvents, Kevlar and Nomex proved to be a challenge, but this was eventually solved.

Another group of polymers, characterized by a high degree of cross-linking, resist deformation and solution once their final morphology is achieved. Such polymers are usually prepared in molds that yield the desired object. Because these polymers, once formed, cannot be reshaped by heating, they are called thermosets .Partial formulas for four of these will be shown below by clicking the appropriate button. The initial display is of Bakelite, one of the first completely synthetic plastics to see commercial use (circa 1910).

A natural resinous polymer called lignin has a cross-linked structure similar to bakelite. Lignin is the amorphous matrix in which the cellulose fibers of wood are oriented. Wood is a natural composite material, nature's equivalent of fiberglass and carbon fiber composites. A partial structure for lignan is shown here