Butyl Rubber typically contains about 98% polyisobutylene with 2% isoprene distributed randomly in the polymer chain. To achieve high molecular weight, the reaction must be controlled at low temperatures (-90 to -100 degC).The reaction is highly exothermic.utyl Rubber typically contains about 98% polyisobutylene with 2% isoprene distributed randomly in the polymer chain. To achieve high molecular weight, the reaction must be controlled at low temperatures (-90 to -100 degC).
There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
1. Millions of people have bipolar disorder; it is a treatable disease. 2. People with bipolar disorder have extreme mood swings. 3. A diagnosis is made after getting information from you, your family members and friends.4. Bipolar disorder affects parts of the brain controlling emotion, thought and drive and is most likely caused by a complex set of genetic and environmental factors.5.ntroduction 4 Mania Depression Bipolar disorder Bipolar disorder is a treatable mood disorder in which people have extreme mood swings that include emotional highs (manias) and lows (depression) (Figure 1). Bipolar disorder was formerly called manic depression or manic-depressive illness.