Thermoplastic vs Thermoset

Thermoplastic vs Thermoset

Thermoplastic inoreva chivakwa icho chinhu chinogona kuyerera nekukanganisa kana chapiswa, uye chinogona kuchengetedza chimwe chimiro mushure mekutonhora. Mazhinji mutsara mapolymers anoratidza thermoplasticity uye anogadziriswa zviri nyore neextrusion, jekiseni kana kuvhuvhuta. Thermosetting zvinoreva chivakwa icho chisingagone kupfaviswa nekuumbwa repeatedly kana ichipisa, uye haigoni kunyungudutswa muzvinonyungudutsa. Bulk polymers vane pfuma iyi.

Thermosetting ikemikari shanduko. Mushure mekupisa, chimiro chakashanduka chikava chimwe chinhu. Semuenzaniso, haugone kudzorera zai mushure mekubikwa. Thermoplasticity ishanduko yemuviri. Kungoti mamiriro ezvinhu anoshanduka kana apisa, asi chimiro hachichinji. Ichiri chizvarwa. Semuenzaniso, kana kenduru yakanyungudutswa nekupisa, inogona kudzorerwa kune kenduru yepakutanga, asi kupisa kwekenduru kuchinja kwemakemikari.

1. Thermoplastics

Inova yakapfava uye inoyerera kana ichipisa, uye inoomesa kana yatonhodzwa. Iyi nzira inodzokororwa uye inogona kuva repeated. Polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic plastiki, mamwe polyolefins uye copolymers avo, polysulfide, polyphenylene ether, chlorinated polyether, etc. Iyo thermoplastic. Iyo resin molecular cheni mu thermoplastics ese ane mutsara kana matavi. Iko hakuna chemikemikari chisungo pakati pecheni dzemamorekuru, uye inopfava uye inoyerera kana ichipisa. Nzira yekutonhodza uye kuomesa ishanduko yemuviri.

2. Thermosetting mapurasitiki

Kana ichipisa kekutanga, inogona kupfava uye kuyerera. Kana yadziiswa kune imwe tembiricha, kemikari inoitika kuyambuka uye kuoma kuti iome. Shanduko iyi haidzoreki. Pashure pacho, kana yadziyirwa zvakare, haichagoni kuva yakapfava uye ichiyerera. Imhaka yeunhu uhwu kuti kuumbwa kunoitwa, uye kuyerera kwepurasitiki panguva yekudziya kwekutanga kunoshandiswa kuzadza gomba pasi pekumanikidzwa, uyezve kusimba kuita chigadzirwa chechimiro chakatemwa uye ukuru. Nyaya iyi inonzi thermoset.

Iyo resin ye thermosetting mapurasitiki ane mutsara kana matavi asati apora. Mushure mekurapa, zvisungo zvemakemikari zvinoumbwa pakati pemaketani emamorekuru kuita matatu-dimensional network chimiro. Kwete chete haigoni kunyungudutswa zvakare, asi haigoni kunyungudutswa muzvinonyungudutsa. Phenolic, aldehyde, melamine formaldehyde, epoxy, unsaturated polyester, silicone uye mamwe mapurasitiki ese ari thermosetting mapurasitiki.

Thermoplastic vs Thermoset