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.
The mental illness called Bipolar disorder is caused by faulty transmission in the limbic system of brain of neurotransmitters serotonin, dopamine and norepinephrine. Bipolar disorder is corrected by Mood stabilizers and antidepressants by Psychiatrists.he term manic depression â¦ is much misunderstood. Some  people think manic means really depressed.. Mania is the  'opposite' of depression. A manic depressive is someone who cycles  between being manic and depressed.