Mienzaniso yeMibvunzo Inokurukura Hukama Huripo Pakati Pechimiro Nehunhu hwePolymers
Pendauluan
MaPolymer zvinhu zvakasiyana zvinoumbwa nemaketani marefu, anodzokororwa emamorekuru anonzi mamonomer. Maumbirwo ePolymer anogona kusiyana zvakanyanya, uye kusiyana uku kunokanganisa zvakananga hunhu hwavo hwepanyama. Kunzwisisa kuti chimiro chePolymer chinokanganisa sei hunhu hwavo kwakakosha mukushandiswa kwakasiyana-siyana kwetekinoroji uye kwemaindasitiri. Chinyorwa chino chichakurukura mimwe mienzaniso yezvinetso zvinoongorora hukama huripo pakati pechimiro chePolymer nehunhu.
1. Lineal Polymers vs. Matavi Polymers
Muenzaniso Mubvunzo 1:
Tsanangura kuti maumbirwo e polyethylene ane mutsetse uye ane matavi anokanganisa sei kunyunguduka kwayo uye simba rayo remuchina.
Kukurukurirana:
Polyethylene (PE) ndeimwe yemapolymer anonyanya kushandiswa uye inowanikwa mumhando mbiri huru dzemaumbirwo: linear uye branched.
– Polyethylene Yakatsetseka (HDPE):
Iyi polyethylene ine chimiro chakaita semutsetse chine matavi mashoma kana kuti chisina matavi. Nekuti cheni dzayo dzinogona kubatana zvakanaka, polyethylene yakatsetseka ine huwandu hwakawanda uye kristallinity yakakwira. Hunhu uhu hunoita kuti HDPE ive:
– Nzvimbo yakanyanya kunyunguduka: Nekuda kwekuwanda kwehuwandu hwezvinhu, zvinoomera kuti mamorekuru afambe, zvichireva kuti simba rakawanda (tembiricha) rinodiwa kuti rinyunguduke.
– Simba guru remuchina: Chimiro chayo chakasimba chinopa simba rekusimba uye kuramba kuchichinja.
– Polyethylene Yakapararira (LDPE):
Polyethylene iyi ine cheni huru ine matavi mapfupi akawanda. Matavi aya anodzivirira cheni huru kuti dzisabatane, zvichikonzera kusimba kwakaderera uye crystallinity shoma. Izvi zvinoita kuti LDPE ive ne:
– Nzvimbo yakaderera yekunyunguduka: Nekuda kwechimiro chakasununguka, mamorekuru anofamba zviri nyore, zvinoreva kuti tembiricha inodiwa kuti anyunguduke yakaderera.
– Simba remuchina rakaderera: Kushaikwa kwehuwandu hunokonzera kuti HDPE ive yakapfava uye isinganyanyi kusimba pakumanikidzwa.
2. Crystalline vs. Amorphous Polymers
Muenzaniso Mubvunzo 2:
Maumbirwo ekristalline neamorphous ari muPolypropylene (PP) anokanganisa sei kujeka kwayo uye kuoma kwayo?
Kukurukurirana:
Polypropylene inogona kuva nechimiro chekristaro kana chisina chimiro, zvese zvine hunhu hwakasiyana hwemuviri.
- Polypropylene yeCrystalline:
– Kuoma Kwakanyanya: Chimiro chekristaro chakajairika chinopa kuoma kwakanyanya uye simba rekusunga.
– Kusapenya Zvishoma: Maumbirwo akajairwa ekristaro anowanzo paradzira chiedza, zvichiita kuti chinhu chacho chisanyatsojeka kana kuti chisaonekwe zvakanyanya.
- Polypropylene isina chimiro:
- Kuchinjika Zvikuru: Maumbirwo asina kurongeka uye asina kusimba anopa kuchinjika uye kusimba kwakawanda.
– Yakajeka Zvikuru: Nekuda kwekushaikwa kwechimiro chakajairika chinogona kuparadzira chiedza, polypropylene isina chimiro inowanzo penya zvakanyanya.
3. Kupesvedzera kweMapoka Anoshanda
Muenzaniso Mubvunzo 3:
Mapoka anoshanda ester mumapolyester anokanganisa sei hydrophobicity uye kuramba kuora?
Kukurukurirana:
Mapoka anoshanda mucheni yepolymer anogona kukanganisa zvakanyanya hunhu hwayo hwemakemikari:
- Hunhu Hwekutyisa Mvura:
Mapoka eester (-COO-) ari mupolyester anopa chinhu ichi hunhu hwacho hwekusapindirana nemvura. Mapoka aya haawanzo pindirana nemamorekuru emvura, zvichikonzera chinhu chisingapindi mvura—chinhu chinokosheswa zvikuru mumachira uye mumapakeji.
- Kuramba Kuora:
Boka re ester rinonyungudika nyore nyore, kunyanya munzvimbo dzine acidic kana kuti dzine acidity. Nokudaro, polyester haina simba rakawanda rekukanganiswa nemakemikari pasi pemamiriro ezvinhu aya. Zvisinei, munzvimbo dzisina ngura, polyester inodzivirira kukanganiswa zvakanaka, zvichiita kuti ikodzere kushandiswa kwakasiyana-siyana panze.
4. Mhedzisiro yeMolecular Weight
Muenzaniso Mubvunzo 4:
Kurema kwemamorekuru epolystyrene kunokanganisa sei viscosity yayo uye simba rayo rekudhonza?
Kukurukurirana:
Kurema kwemamorekuru chimwe chezvinhu zvikuru zvinopesvedzera hunhu hwemapolymers:
- Kusviba:
Sezvo huremu hwemamorekuru huchiwedzera, viscosity (resistance to flow) yepolystyrene inowedzerawo. Mamorekuru marefu ane nzvimbo dzakawanda dzekubatana, zvichigadzira resistance yemukati kana zvinhu zvikaedza kuyerera.
- Simba reKusimba:
Polystyrene ine huremu hwakanyanya inowanzova nesimba guru rekusunga. Maketani marefu anopa nzvimbo dzakawanda dzekukiya uye anowanzo kuparadzira kushushikana zvakaenzana mukati mechinhu chose, zvichikonzera kuti ive yakasimba uye inodzivirira kuchinjika.
5. Zvimiro zveCrosslink neElastomer
Muenzaniso Mubvunzo 5:
Kuvapo kwe crosslinks mu natural rabber (polyisoprene) kunokanganisa sei elasticity uye kuramba zvinonyungudutsa?
Kukurukurirana:
Kubatanidzana zvinoreva kubatana kwe covalent pakati pemaketani e polymer anoumba network ine mativi matatu. Mhedzisiro yayo ndeiyi inotevera:
- Kusasimba:
Kubatanidza rabha yechisikigo kunowedzera kusimba uye kuramba kuchinja. Kubatanidza kunodzivirira cheni dzepolymer kuti dzisafambe-fambe kana dzashandiswa, zvichiita kuti chinhu chidzoke pachimiro chacho chepakutanga mushure mekudhonzwa.
- Kuramba Kunyungudutsa:
Mapolymer akabatana anodzivirira kunyungudika kwe solvent. Network ine mativi matatu inogadzirwa ne crosslinking inoita kuti polymer iome kunyungudika mu solvents, zvichiita kuti irambe yakasimba mumamiriro akasiyana-siyana emakemikari.
Mhedziso
Kunzwisisa hukama huripo pakati pechimiro chepolymer nemaitiro kwakakosha pakugadzira nekushandisa zvinhu. Mienzaniso yakakurukurwa inosanganisira zvinhu zvakasiyana-siyana zvechimiro chepolymer—kubva pachimiro checheni, kristallinity, kuvapo kwemapoka anoshanda, huremu hwemamorekuru, uye kubatana—uye kuti zvinhu izvi zvinobatsira sei pakuva nemaitiro akasiyana emuviri. Nekunzwisisa hukama uhwu, tinogona kugadzira mapolymer ane maitiro chaiwo akagadzirirwa mashandisirwo chaiwo.
Ruzivo urwu haruna kukosha chete kune mainjiniya emakemikari nesainzi yezvinhu, asiwo kune maindasitiri anoshandisa mapolymers muzvigadzirwa zvezuva nezuva, kuitira kuti hunyanzvi hutsva uye kuvandudzwa kurambe kuchiitika zvigone kuwanikwa.
