Sivame ukufunda ngamapulasitiki ngokubukeka, umbala, ukungezwani, ubukhulu, njll., ngakho-ke kuthiwani ngamapulasitiki ngokombono wamakhemikhali?
I-synthetic resin iyingxenye eyinhloko yepulasitiki, futhi okuqukethwe kwayo epulasitiki ngokuvamile ku-40% kuya ku-100%.Ngenxa yokuqukethwe okukhulu kanye nezakhiwo zama-resin avame ukunquma izakhiwo zepulasitiki, abantu bavame ukubheka ama-resin njengefana nepulasitiki.
Ipulasitiki iyinhlanganisela ye-polymer eyenziwe nge-monomer njengento eluhlaza futhi yenziwe i-polymerized ngokufaka noma ukusabela kwe-polycondensation.Ukumelana kwayo nokuguqulwa kuphakathi, phakathi kwe-fiber nerabha.Yakhiwa izithasiselo ezifana ama-ejenti kanye pigments.
I-Plastiki Incazelo Nokubunjwa: Ipulasitiki yinoma iyiphi i-polymer ephilayo yokwenziwa noma ephakathi.Ngamanye amazwi, ipulasitiki ihlale iqukethe i-carbon ne-hydrogen, nakuba ezinye izakhi zingase zibe khona.Ngenkathi amapulasitiki angenziwa cishe kunoma iyiphi i-polymer ephilayo, amapulasitiki amaningi ezimboni enziwa ngamakhemikhali e-petrochemicals.I-Thermoplastic kanye ne-thermoset polymers yizinhlobo ezimbili zamapulasitiki.Igama elithi "ipulasitiki" libhekisela ku-plasticity, ikhono lokukhubazeka ngaphandle kokuphuka.Ama-polymers asetshenziselwa ukwenza amapulasitiki ahlala exubene nezithasiselo, kufaka phakathi ama-colorants, ama-plasticizers, ama-stabilizers, ama-fillers, nama-ejenti aqinisayo.Lezi zengezo zithinta ukwakheka kwamakhemikhali, izakhiwo zamakhemikhali nezomshini zamapulasitiki, kanye nezindleko.
Ama-Thermosets kanye nama-Thermoplastics: Ama-polymers we-Thermoset, abuye aziwe ngokuthi ama-thermosets, elapha abe yisimo esihlala njalo.Ziyi-amorphous futhi zikholelwa ukuthi zinesisindo esingapheli samangqamuzana.I-Thermoplastics, ngakolunye uhlangothi, ingashiswa futhi ihlelwe kabusha ngokuphindaphindiwe.Amanye ama-thermoplastics ane-amorphous, kanti amanye anesakhiwo se-crystalline ingxenye.I-Thermoplastics ngokuvamile inesisindo samangqamuzana phakathi kuka-20,000 no-500,000 AMU.
Isikhathi sokuthumela: Sep-17-2022