Kedu ihe kpatara PTFE nwere ike iguzogide oke okpomọkụ?

Nke mbụ bụ n'ihi na ebe mgbaze ya dị ihe dịka 327 degrees Celsius, nke dị elu karịa nke PE (~ 130) na PVDF (~ 177) nwere ihe ndị yiri ya. Isi ihe na-ekpebi ebe mgbaze bụ ike dị n'etiti agbụ na ụmụ irighiri ihe. , ọ bụ ezie na fluorine nwere nnukwu electronegativity, ma site na usoro kemịkalụ nke PTFE, oge dipole na-akagbu ibe ya, ya mere, ọ bụ ihe na-abụghị polar ma ọ dịghị emepụta ike ntụgharị uche doro anya, nke pụtara na ike mgbasa ozi bụ isi mmetụta Ya mere. , Ọ bụ ihe ezi uche dị na ya ikwu na ebe mgbaze nke PTFE ekwesịghị ịdị elu karịa nke PE, mana njupụta electron dị elu nke fluorine na-eme ka atom fluorine ndị a haziri ahazi na-enwe mmegide na-asọ oyi na mmetụta mgbochi steepụ, nke mere na agbụ molecular conformation. na-enye usoro spirochete, kama usoro zigzag dị larịị nke a na-ahụkarị na polymers juru eju, nke na-eme ka akpụkọ nke ụdọ molekụla dị mma ka ọ bụrụ kristal, na mbelata nkewa dị n'etiti agbụ ndị a kpụrụ akpụ na-abawanye ike intermolecular wee si otú a na-abawanye ebe mgbaze. .

Nke abụọ bụ nkwụsi ike nke PTFE na oke okpomọkụ. Maka polymers, otu n'ime isi ihe kpatara mmebi nke arụmọrụ na nsị bụ nbibi nke agbụ n'ime obere ụmụ irighiri ihe. Ebe ọ bụ na CF agbụ siri nnọọ ike, CC agbụ na isi yinye usoro N'ikwu ya n'ụzọ ọzọ, ọ na-adịkarị mfe imebi, ma n'ihi ịdị adị nke CF, ọ na-emepụta a hyperconjugation mmetụta na ya dị nso CC (mgbochi-bonding orbital nke). CF na njikọta orbital mmekọrịta nke CC), nke na-emekwa ka ọnyà isi na-eguzogide okpomọkụ / ọkụ dị elu. N'otu oge ahụ, mmetụta hyperconjugation na-eweta ike dị ala nke ọnọdụ ortho (gauche) karịa ọnọdụ mgbochi (mgbochi), nke na-akọwakwa ihe kpatara na ọ bụ ezie na e nwere mmetụ electrostatic n'etiti fluorines, ha ka na-emetụta ike ike. A na-ewepụ uru nke atọm fluorine ka e wee hazie atọm fluorine nke ọma na PTFE.

Atọm fluorine ndị ahụ haziri ahazi nwere usoro octahedral zuru oke, yabụ na ha abụghị ezigbo ndị na-enye onyinye elektrọn ma ọ bụ ndị na-anabata elektrọn. Ha na-ekechi agbụ isi na-esighị ike n'etiti, dị ka ịmepụta ihe nkiri nchebe. Na-eguzogide ọgụ kemịkalụ, na-enye PTFE ezigbo nguzogide kemịkalụ. Ihe ọzọ kpatara nhazi ahụ siri ike bụ ike dị ala, nke mere na PTFE enweghị mmasị na ụmụ irighiri ihe ndị mba ọzọ, nke mere na ọ naghị arapara n'ahụ.