Mitundu ya polypropylene.

Mamolekyu a polypropylene ali ndi magulu a methyl, omwe angagawidwe m'magulu a isotactic polypropylene, atactic polypropylene ndi syndiotactic polypropylene malinga ndi momwe magulu a methyl amakhalira. Magulu a methyl akaikidwa mbali imodzi ya unyolo waukulu, amatchedwa isotactic polypropylene; ngati magulu a methyl agawidwa mwachisawawa mbali zonse ziwiri za unyolo waukulu, amatchedwa atactic polypropylene; pamene magulu a methyl aikidwa motsatizana mbali zonse ziwiri za unyolo waukulu, amatchedwa syndiotactic. polypropylene. Pakupanga polypropylene resin, kuchuluka kwa kapangidwe ka isotactic (kotchedwa isotacticity) ndi pafupifupi 95%, ndipo kotsalako ndi atactic kapena syndiotactic polypropylene. Polypropylene resin yomwe imapangidwira ku China imagawidwa malinga ndi kuchuluka kwa kusungunuka ndi zowonjezera zomwe zawonjezeredwa.

Polypropylene ya Atactic ndi chinthu chochokera ku kupanga polypropylene ya isotactic. Polypropylene ya Atactic imapangidwa popanga polypropylene ya isotactic, ndipo polypropylene ya isotactic imalekanitsidwa ndi polypropylene ya atactic pogwiritsa ntchito njira yolekanitsira.

Polypropylene ya Atactic ndi chinthu cholimba kwambiri cha thermoplastic chomwe chili ndi mphamvu yokoka bwino. Chingathenso kusinthidwa kukhala vulcanized ngati rabara ya ethylene-propylene.