Nea ɛnte sɛ thermoplastics no, wɔtaa de elastomers di dwuma wɔ ɔhyew ahorow pii mu na ɛboro wɔn glass transition temperature (Tg) so kɛse. Mfaso a ɛwɔ elastomers so sen thermoplastics ne sɛnea ɛkame ayɛ sɛ tumi a ɛsan nya ahoɔden koraa fi tensile tebea no mu (high elasticity), ne wɔn generalized elasticity, low hardness ne low modulus properties. Sɛ wɔde elastomer di dwuma wɔ dan mu hyew ase a, ɛkyerɛ sɛ ne den kɔ soro, ne modulus kɔ soro, na ɛlasticity so tew. Sɛ wɔde elastomers di dwuma wɔ dan mu hyew ase a, su bi wɔ hɔ a ɛma denden kɔ soro, modulus kɔ soro, elasticity so tew (low tensile) na compression set sɛ ɛkɔ soro. Ɛgyina ɔhaw a ɛwɔ elastomer no so no, nneɛma abien betumi asi bere koro mu - ahwehwɛ a ɛyɛ den ne ahwehwɛ a ɛyɛ fã bi - CR, EPDM, NR yɛ elastomer ahorow bi a ɛda ahwehwɛ mu nhwɛso adi.
1. Ɔhyew a ɛba fam sɔhwɛ ho nsɛm a wɔaka abom
Wɔde Brittleness, compression permanent deformation, retraction, hardening ne cryogenic hardening adi dwuma mfe pii sɛnea ɛbɛyɛ a wɔbɛkyerɛ polymer su ahorow wɔ ɔhyew a ɛba fam mu. Compressive stress relaxation yɛ ade foforo koraa na ɛtwe adwene si tumi a wɔde kata ade bi so wɔ bere bi mu wɔ nneɛma ahorow a atwa yɛn ho ahyia mu no so.
2. Brittleness Ɔhyew a ɛyɛ hyew
ASTM D 2137 kyerɛkyerɛ brittleness temperature mu sɛ ɔhyew a ɛba fam koraa a vulcanized rubber renkyerɛ sɛ ɛpaapae anaasɛ ɛpaapae wɔ nkɛntɛnso tebea horow a wɔakyerɛ mu. Wɔsiesie rɔba nhwɛsoɔ anum a wɔadi kan ahyɛ ne nsɛsoɔ, de gu dan anaa nsuo mu, de ahyɛ ɔhyeɛ a wɔahyɛ mu ma 3±0.5min, na afei wɔma no ahoɔhare a ɛbɔ 2.0±0.2m/s. Woyi nhwɛsode ahorow no na wɔde yɛ nhwehwɛmu a ɛkyerɛ sɛnea ɛbɛbɔ anaasɛ ɛbɛpaapae. Woyi nhwɛsode no na wɔsɔ hwɛ sɛ ebia abɔ anaasɛ abubu, na ne nyinaa nsɛee. Wɔsan yɛɛ sɔhwɛ no kosii brittleness temperature - ɔhyew a ɛba fam koraa a wɔanhu abubu biara no bɛn 1°C yiye.
3. Ɔhyew a ɛba fam Compression Set ne Ɔhyew a ɛba fam Hardening
Sɔhwɛ kwan a wɔfa so yɛ no ma compression set a ɛba fam no bɛn nea wɔde yɛ standard compression set no yiye, gye sɛ wɔde ahoɔden kwan bi, te sɛ nsukyenee a ɛyɛ dry, nitrogen a ɛyɛ nsu, anaa mfiri akwan na ɛhwɛ ɔhyew no so, na bo no wɔ ± 1°C mu wɔ ɔhyew a wɔahyɛ ato hɔ no mu. Sɛ wɔsan nya fixture no mu wie a, wɔde nhwɛsode no nso si ɔhyew a ɛba fam a wɔahyɛ ato hɔ no mu na wɔanwene no ma ne kɛse yɛ mm 29 na ne kɛse yɛ mm 12.5. Low-temperature compression set yɛ ɔkwan a ɛnteɛ a wɔfa so de sealing applications a ɛwɔ aduru a yɛreka ho asɛm no mu. Compressive stress relaxation ne ɔkwan a wɔfa so yɛ no tẽẽ na yɛbɛka ho asɛm akyiri yi. Wɔtaa de vulcanized compression set specimen (29mm x 12.5mm) nso kyerɛ ɔhyew a ɛba fam a ɛyɛ den, nanso wɔsan sɔ hwɛ wɔ ɔhyew a ɛba fam control so, a ɛne compression set yɛ pɛ, na afei wɔsan sɔ hwɛ bio wɔ ɔhyew koro no ara mu sɛnea wɔn ɔhyew a wɔahyɛ no. Hardening ne low-temperature compression set no nya nkɛntɛnso tẽẽ denam onwini so, nanso nso ɛnam su a polymer no wɔ sɛ ɛbɛyɛ crystallize no so, a crystallization no ntɛmntɛm gyina ɔhyew so, s.e., CR crystallizes ntɛmntɛm sen biara bɛyɛ -10°C, na afei ɛso tew wɔ ɔhyew a ɛba fam mu, titiriw esiane polymer nkɔnsɔnkɔnsɔn afã horow no a entumi nkɔ baabiara nti (molecular nkɔnsɔnkɔnsɔn no yɛ freeze ansa nhyehyɛe foforo a wɔsan yɛ).
4. Gehman Ɔhyew a Ɛba Fam a Ɛyɛ Den
ASTM D 1053 kyerɛkyerɛ ɔkwan a wɔfa so yɛ den wɔ ɔhyew a ɛba fam mu no mu sɛnea edidi so yi: wɔde elastic polymer nhwɛsode ahorow a ɛtoatoa so bata waya bi a wonim sɛ ɛyɛ torsional constant ho, na wɔde waya no awiei foforo no bata torsion ti a ebetumi ama kwan ma wɔakyinkyim waya no ho. Wɔde nhwɛsode ahorow no hyɛ ɔhyew a wɔde fa nneɛma mu mu wɔ ɔhyew pɔtee bi a ɛba fam sen sɛnea ɛte daa mu, saa bere no wɔkyinkyim torsion ti no 180°, na afei wɔkyinkyim nhwɛsode ahorow no dodow (a ennu 180°) a egyina nhwɛsode no a ɛyɛ mmerɛw ne nea ɛyɛ den no akyi. Afei fa goniometer dodow no kyerɛ dodow a specimen twist, angle a twist ne hardness a rɔba ade no. Wɔma nhyehyɛe no hyew kɔ soro nkakrankakra wɔ saa beae yi, na wonya sɛnea ɛkyinkyim no kyerɛ ɔhyew no ho mfonini. Wɔtaa kyerɛw ɔhyew a modulus no du T2, T10, ne T100 no sɛ ɛne modulus bo a ɛwɔ dan mu hyew mu no yɛ pɛ.
5. Ɔhyew a Ɛba Fam a Wɔtwe (TR Sɔhwɛ) .
Wɔde TR sɔhwɛ no di dwuma de hwɛ tumi a nhwɛsode bi wɔ wɔ tensile tebea mu bere a wɔde compressive permanent deformation ne compressive stress relaxation a wɔde compressive stress kyerɛ no di dwuma de kyerɛ ɔhyew a ɛba fam nsunsuanso. Sɛnea yɛadi kan aka ho asɛm no, polymers pii te sɛ NR ne PVC bɛyɛ ahwehwɛ wɔ ɔhyew a ɛba fam mu, nanso sɛ wɔtrɛw mu nso betumi ayɛ ahwehwɛ, na ɛde nneɛma foforo ba bere a wɔrehwɛ ɔhyew a ɛba fam su ahorow no. Wɔ nhwehwɛmu dwumadie te sɛ exhaust suspension, TR under tension fata yie na wɔtaa de di dwuma. Wɔ sɔhwɛ yi mu no, wɔyɛ nhwɛsode no tenten (mpɛn pii no 50% anaa 100%) na ɛyɛ nwini wɔ tebea a ɛyɛ tenten no mu. Wɔgyae nhwɛsode no, saa bere no wɔma ɔhyew no kɔ soro wɔ ɔkwan a wɔahyɛ ato hɔ so de susuw sɛnea nhwɛsode no san ba, wɔsusuw sɛnea ɛtwetwe no tenten na wɔkyerɛw ne tenten. Wɔtaa hyɛ ɔhyew a nhwɛsode no so tew 10%, 30%, 50%, ne 70% no nsow sɛ TR10, TR30, TR50, ne TR70. TR10 fa brittleness hyew ho; TR70 fa daa deformation a ɛwɔ nhwɛsode no mu wɔ low-teature compression mu; na wɔde nsonsonoe a ɛda TR10 ne TR70 ntam no susuw nhwɛsode no mu ahwehwɛ (dodow a nsonsonoe no yɛ kɛse no, dodow no ara na su a ɛma ɛyɛ ahwehwɛ no yɛ kɛse).
6 . Ɔhyew a Ɛba Fam Nhyɛso a Ɛma Adwennwen Ahomegye (CSR) .
Wobetumi de CSR sɔhwɛ no adi dwuma de ahyɛ nkɔm afa sɛnea nneɛma a wɔde nsɔano yɛ adwuma ne ne nkwa nna ho. Sɛ wɔma elastomeric aduru bi sɛ ɛsakra bere nyinaa a, wɔde tumi a wɔaka abom ba, na tumi a ade no tumi kura tumi yi mu wɔ nneɛma a atwa yɛn ho ahyia pɔtee bi mu no susuw sɛnea ebetumi asɔw ano. Honam fam ne nnuru akwan nyinaa boa ma adwennwen gyae, egyina bere ne ɔhyew so, ade biako bedi tumi, wohu nipadua mu ahomegye wɔ ɔhyew a ɛba fam mu, wɔ nhyɛso bi a wɔde ama akyi pɛɛ, a ɛde nkɔnsɔnkɔnsɔn no san hyehyɛ na nsakrae ba rɔba-hyɛ ne nea wɔde hyɛ mu ma no ani, na adwennwen a woyi fi hɔ nhyehyɛe no mu ahomegye no yɛ nea wotumi dannan. Wɔ ɔhyew a ɛkorɔn mu no, nnuru a ɛwɔ mu no na ɛkyerɛ sɛnea nipadua no mu nneɛma a ɛyɛ mmerɛw no sua dedaw na nnuru a ɛma ahomegye no yɛ nea wontumi nsakra no, na ɛde nkɔnsɔnkɔnsɔn no bubu ne cross-linking reactions ba. Ɔhyew a ɛkyinkyini anaasɛ ɔhyew a ɛkɔ soro mpofirim no betumi anya adwennwen a ɛma ɛyɛ mmerɛw wɔ elastomers mu no so nkɛntɛnso. Wɔ CSR sɔhwɛ no mu no, wɔde sɔhwɛ nhwɛsode no si hɔ
Wɔ CSR sɔhwɛ mu no, adwennwen a ɛma obi ho dwo no kɔ soro bere a wɔde sɔhwɛ nhwɛsode no to ɔhyew a ɛkɔ soro mu no. Sɛ adwennwen mu ahomegye ba ntɛm wɔ sɔhwɛ no mu a, ahomegye foforo dodow no di kan kɔ soro na ɛwɔ bo a ɛsen biara wɔ kyinhyia a edi kan no mu. Wɔ tensile kɛse sɔhwɛ afã a wɔde bɛyɛ gasket nhwɛsode (19mm akyi diameter, mu diameter 15mm), a elastic fixture bɛ compressed to the specimen to wɔn dan mu hyew thickness 25%, na wɔ 25 ° C mu nneɛma a atwa yɛn ho ahyia sɔhwɛ dan no mu, ɔhyew a ɛwɔ 25 °C sɛ ɛbɛkɔ so ayɛ 24h, na afei akɔ fam akodu -20 °C, ahwɛ so ama 24h, akyi no ɔhyew a edi hɔ ntam -20 ~ 110 °C kyinhyia a 24h, sɔhwɛ bere nyinaa wɔ sɔhwɛ ɔhyew, sɔhwɛ ɔhyew, kɔ so tumi gyinaesi. Wɔyɛ ahoɔden susuw no daa wɔ sɔhwɛ bere no nyinaa mu wɔ sɔhwɛ hyew no mu.
7. Nkɛntɛnso a Ethylene a Ɛwɔ Mu So
7.1 Ethylene a ɛwɔ mu no na ɛwɔ nkɛntɛnsoɔ kɛseɛ wɔ EPDM polymers adwumayɛ a ɛba fam no so. Wɔhwɛɛ polymers a Ethylene dodoɔ firi 48% kɔsi 72% wɔ sealing formulations a ɛyɛ papa ase. Wɔn nyinaa botae ne sɛ wɔbɛtew nsakrae a ɛba mooney viscosity mu denam ENB a wɔde bɛhyɛ saa polymers ahorow yi mu no so.
EPDM rɔba yɛ amorphous sɛ ethylene/propylene ratio yɛ pɛ na monomers abien a ɛwɔ polymer nkɔnsɔnkɔnsɔn no mu no kyekyɛ yɛ random a. EPDM a ethylene 48% ne 54% wom no nnyɛ kristal wɔ dan mu hyew anaa nea ɛboro saa mu. Sɛ ethylene a ɛwɔ mu no du 65% a, ethylene ntoatoasoɔ no firi aseɛ kɔ soro wɔ dodoɔ ne ne tenten mu na ɛtumi yɛ ahwehwɛ, a wɔhunu wɔ ahwehwɛ dodoɔ a ɛwɔ DSC curves no so bɛyɛ 40°C. Dodow a DSC nkoko no yɛ akɛse no, dodow no ara na ahwehwɛ a ɛba no yɛ akɛse.
7.2 Wɔ nkɛntɛnsoɔ a ethylene a ɛwɔ mu nya wɔ ɔhyew a ɛba fam su a yɛaka ho asɛm akyiri yi no akyi no, crystallite kɛseɛ nya sɛnea ɛyɛ mmerɛw sɛ wɔbɛfrafra na wɔayɛ nneɛma a ahwehwɛ wom no ho adwuma. Dodow a crystallite no kɛse yɛ kɛse no, dodow no ara na ɛho hia sɛ wɔyɛ ɔhyew ne shear adwuma pii wɔ afrafra fã no mu na ama polymer no ne nneɛma afoforo no afra koraa. Rɔba a wɔannoa no ahoɔden a ɛwɔ EPDM nnuru mu no kɔ soro bere a ethylene a ɛwɔ mu no kɔ soro no. Wɔ nnuru a wɔde siw ano a wɔsusuu nkɛntɛnso a ethylene a ɛwɔ mu no nya mu no, ethylene dodow a ɛkɔɔ soro fi 50% koduu 68% no maa anyɛ yiye koraa no, rɔba no ahoɔden kɔɔ soro mpɛn anan. Pia mu hyew a ɛyɛ den nso kɔ soro bere a ethylene a ɛwɔ mu no kɔ soro no. Shore A a ɛyɛ den a ɛwɔ amorphous polymer adhesive no mu yɛ 63°, bere a Shore A denden a ɛwɔ polymer a ethylene pii wom no mu yɛ 79°. Eyi fi ethylene nnidiso nnidiso a ɛkɔ soro, ahwehwɛ a ɛkɔ soro wɔ ade a wɔde nkata so no mu, ne thermoplastic polymers a ɛkɔ soro a ɛne no hyia no.
7.3 Sɛ wɔsusu denden no wɔ ɔhyew a ɛba fam mu a, nea ɛne polymers a ethylene pii wom no bɔ abira no, amorphous polymers no kyerɛ nsakrae kakraa bi wɔ hardness mu, bere a nsakrae a ɛba hardness mu wɔ ethylene a ɛkɔ soro no mu no nkyerɛ linear pattern na hardness no kɔ so yɛ kɛse wɔ dan mu hyew mu, sɛnea ɛbɛyɛ a polymers a ethylene dodow a ɛkɔ soro wom no kɔ so nya hardness a ɛkorɔn sen biara wɔ ɔhyew a ɛba fam mu.
7.4 Compression set no gyina sɔhwɛ no hyew so kɛse. Sɛ wɔsɔ hwɛ wɔ 175°C a, nsonsonoe biara nni compression set mu wɔ polymers no mu biara ntam (set no nya nkɛntɛnso wɔ sɛnea wɔyɛɛ aduru no ne vulcanization nhyehyɛe a wɔpaw no so). Bere a ethylene ahwehwɛ no ayow akyi no, polymer no da ɔkwan a ɛnyɛ nsɛ adi, na sɛnea ɛbɛyɛ a wɔbɛhwehwɛ nkɛntɛnso a ethylene a ɛwɔ mu no nya mu no, wɔyɛɛ sɔhwɛ ahorow wɔ 23°C. Ɛda adi pefee sɛ polymers a ethylene pii wom no wɔ deformation a ɛtra hɔ daa kɛse (ɛboro mmɔho abien), na nkɛntɛnso a ethylene a ɛwɔ mu no nya no yɛ kɛse mpo bere a wɔsɔ hwɛ wɔ -20°C ne -40°C no. Polymers a ethylene boro 60% wom no wɔ deformation a ɛtra hɔ daa a ɛkorɔn (>80%); wɔ -40°C mu no, polymers a ɛnyɛ nsɛ koraa nkutoo na ɛwɔ deformation a ɛtra hɔ daa a ɛba fam (17%).
7.5 Nsunsuansoɔ a Ethylene a ɛwɔ mu nya wɔ Ɔhyeɛ a ɛba fam a ɛyɛ den a ɛfiri Gehman Sɔhwɛ mu. Sɛ wɔde ɔhyew bi ma a, dodow a ntwea no kɔ soro no, dodow no ara na nea ɛyɛ den no kɔ soro (anaasɛ modulus no kɔ soro). Wɔ ɔhyew a ɛba fam mu no, stiffness modulus no kɔ soro kɛse bere a ethylene a ɛwɔ mu no kɔ soro no. Wɔ amorphous polymers fam no, T2 no yɛ -47°C, bere a polymer a ethylene wom sen biara no wɔ T2 a ɛyɛ -16°C pɛ.
7.6TR susuw shrinkage recovery a specimens akyi extension freezing akyi no, ethylene a ɛwɔ mu no nya nkɛntɛnso kɛse wɔ sɔhwɛ kwan no so, a ɛsan te sɛ Gehman sɔhwɛ no.
Eyi te sɛ Gehman sɔhwɛ no. Polymer ahorow no shrinkage (%) gu ahorow sɛnea ɔhyew dwumadi te, a amorphous polymers no na shrinkage recovery a ɛkorɔn sen biara wɔ ɔhyew a ɛba fam mu; nanso sɛnea wɔhyɛɛ nkɔm no, sɛnea ɛsan nya ahoɔden no sɛe bere a ethylene a ɛwɔ mu no kɔ soro wɔ ɔhyew bi a wɔde ama mu no.
sɛnea obi ho tɔ no sɛe. TR10 boɔ gu ahodoɔ firi -53°C ma amorphous polymers kɔsi -28°C ma polymers a ethylene dɔɔso wom.
7.7 Compressive stress relaxation (CSR) kyinhyia
Kanko. Mia nnuru no, ma wɔnhome wɔ 25°C h 24, na afei fa gu ɔhyew a efi -20°C kosi 110°C mu bere ne bere mu nnɔnhwerew 24. Sɛ wɔhyɛ no nea edi kan a, wɔ bere a ɛkari pɛ no akyi no, ahwehwɛ polymer E no hwere adwennwen kɛse sen amorphous polymer no, na sɛ wɔtew so kɔ -20°C a, polymers abien no nsɔano tumi so tew, bere a amorphous polymer A no wɔ nhyɛso a ɛkora so kɛse (F/F0 a ɛkorɔn). Sɛ wɔmaa aduru no yɛ hyew koduu 110°C a, ɛmaa ne tumi a ɛsɔ ano no san bae, na bere a wɔsan de baa fam koduu -20°C no, na tumi a aka a ɛsɔ ano a ɛwɔ ahwehwɛ polymer no mu no nnu ne bo no 20%, a wɔtaa bu no sɛ ɛba fam dodo ma dwumadie dodoɔ no ara, a amorphous polymer no kuraa ne nsɔano tumi bɛboro 50%, na amorphous polymer no san nyaa ahoɔden a ɛkorɔn sen polymer no polymer a ɛyɛ ahwehwɛ. Kyinhyia a edi hɔ no de nsɛm a ɛte saa ara baa awiei. Ɛda adi pefee sɛ amorphous polymers korɔn ma sealing applications wɔ baabi a ɛho hia sɛ ɛyɛ hyew a ɛkorɔn ne nea ɛba fam adwumayɛ.
8. Nkɛntɛnso a Diolefin a ɛwɔ mu no nya
Sɛnea ɛbɛyɛ a wobenya unsaturated point a ɛho hia ma vulcanization no, wɔde diolefins a ɛnyɛ conjugated te sɛ ENB, HX ne DCPD ka ethylene propylene polymers ho. Nkitahodi abien biako yɛ adwuma wɔ polymer matrix no mu, bere a nea ɛto so abien no yɛ adwuma sɛ nea ɛka molecule nkɔnsɔnkɔnsɔn a wɔayɛ no polymerized no ho na ɛma vulcanization point ma sulfur yellow vulcanization. Wɔhwɛɛ ENB nkɛntɛnso wɔ mframa ahwehwɛ (osu) bar profiles mu. Wɔde polymers a 2%, 6% ne 8% ENB wom totoo ho.ENB a wɔde kaa ho no nyaa nkɛntɛnso kɛse wɔ vulcanization su ne crosslink density so. Modulus kɔɔ soro bere a elongation so tew kɛse no. Hardness no kɔɔ soro na compression set no yɛɛ yiye bere a ɔhyew no kɔɔ soro no. Bere a ENB mu nneɛma kɔ soro no, bere a wɔde yɛ charring no yɛ tiaa.
ENB yɛ ade a ɛnyɛ nsɛ, na sɛ wɔde ka polymer akyi dompe no ho a, ɛhaw polymer no fã a ɛyɛ ethylene no ahwehwɛ, ma enti wobetumi anya polymers a ethylene dodow yɛ pɛ, na ENB a ɛkɔ soro no ma ɔhyew a ɛba fam no tu mpɔn. Wɔ dan mu hyew mu no, ENB a ɛkɔ soro no ma compression set no tu mpɔn kakra esiane crosslink density a ɛkɔ anim nti. Nanso, wɔ ɔhyew a ɛba fam mu no, compression set a ɛwɔ polymers a ENB pii wom no ye kɛse sen polymers a ENB 2% wom no. Nkɛntɛnso a ENB a ɛwɔ mu nyae wɔ brittleness temperature, temperature retraction, ne Gehman sɔhwɛ no so no ankyerɛ nsonsonoe titiriw biara wɔ brittleness temperature mu wɔ polymers ntam wɔ ɔkwan a ɛkɔ akyiri so, na wɔ Gehman sɔhwɛ ne TR sɔhwɛ no mu no, polymer biara daa nkɔso adi wɔ ɔhyew a ɛba fam su mu bere a ENB dodow kɔ soro no.
9. Nkɛntɛnso a mooney Viscosity nya wɔ Low Temperature Properties so
Wonim yiye sɛ mooney viscosity (molecular mass) nya nkɛntɛnso kɛse wɔ elastomers dwumadie suban so. Wɔ extrusion ne molding dwumadie mu Wɔ extrusion ne molding dwumadie mu no, ɛho hia sɛ wɔpaw aduru a ɛwɔ Mooney viscosity boɔ a ɛfata. Bere a wɔde aduru koro no ara a wɔde hwehwɛɛ nkɛntɛnso a monomer a ɛto so abiɛsa, ENB, nya wɔ ɔhyew a ɛba fam su so de hwehwɛɛ Mooney ntini mu no dii dwuma no, wɔde polymers a Mooney viscosities yɛ 30, 60, ne 80 totoo ho, na Mooney viscosity a ɛwɔ nnuru no mu no kɔɔ soro bere a Mooney viscosity a ɛwɔ polymers a wɔde dii dwuma no mu kɔɔ soro no. Tensile ahoɔden, modulus, ne raw rubber ahoɔden kɔɔ soro bere a Mooney viscosity kɔɔ soro no. Nkɛntɛnso a Mooney viscosity nyae wɔ EPDM hyew a ɛba fam no su so no nyɛ nea ɛho hia. Nanso, compression daa deformation wɔ dan mu hyew, -20°C ne -40°C kɔ soro bere a molecule mass kɔ soro. Nanso, nhyɛso a wɔde sii dan mu hyew, -20°C ne -40°C no ansakra kɛse bere a molecule dodow kɔɔ soro no, bere a nhyɛso a wɔde sii hɔ wɔ ɔhyew a ɛkorɔn (175°C) mu no kyerɛɛ nsakrae bi maa EPDM adhesives no mooney viscosities a ɛkorɔn no.
10. Nsɛm a wɔde wie
Ethylene ne diolefin a ɛwɔ mu no wɔ nkɛntɛnsoɔ kɛseɛ wɔ EPDM elastomers adwumayɛ so wɔ ɔhyew a ɛba fam dwumadie mu, a polymers a ethylene dodoɔ sua no yɛ adwuma yie na polymers a diolefin dodoɔ a ɛwɔ mu no tu mpɔn ɛnam polymer no fã a ɛyɛ ethylene no crystallization a asɛe nti. Ɛsɛ sɛ wɔde polymers a ethylene nni mu pii di dwuma bere a ɔhyew a ɛba fam adwumayɛ yɛ anohyeto.
