CAJ | 학술논문

以八甲基环四硅氧烷（ D4）、二乙烯基四甲基二硅氧烷（亦称乙烯基双封头）为原料，氢氧化钾碱胶为催化剂，采用开环聚合反应制备端乙烯基硅油。考察了聚合温度、聚合时间、物料配比等对单体转化率的影响。结果表明，聚合温度和时间对D4转化率的影响不显著，但对乙烯基双封头的转化率影响显著，随着温度由130℃提高到150℃，乙烯基双封头的转化率由54.62％升高至86.73％；随着聚合时间由3 h延长至6 h，乙烯基双封头的转化率由52.87％升高至86.02％。最佳聚合温度为150℃、聚合时间为6h。采用旋转黏度计研究端乙烯硅油的黏度随剪切速率的变化。端乙烯基硅油为胀流性流体，其流动规律满足通式ηa ＝Krn-1。
이팔갑기배사규양완（ D4）、이을희기사갑기이규양완（역칭을희기쌍봉두）위원료，경양화갑감효위최화제，채용개배취합반응제비단을희기규유。고찰료취합온도、취합시간、물료배비등대단체전화솔적영향。결과표명，취합온도화시간대D4전화솔적영향불현저，단대을희기쌍봉두적전화솔영향현저，수착온도유130℃제고도150℃，을희기쌍봉두적전화솔유54.62％승고지86.73％；수착취합시간유3 h연장지6 h，을희기쌍봉두적전화솔유52.87％승고지86.02％。최가취합온도위150℃、취합시간위6h。채용선전점도계연구단을희규유적점도수전절속솔적변화。단을희기규유위창류성류체，기류동규률만족통식ηa ＝Krn-1。
The vinyl-ended polydimethylsiloxane was synthesized by ring-opening polymerization with oc-tamethylcyclotetrasiloxane (D4) as raw material and 1,3-divinyltetramethylsiloxane as the capping agent and potassium hydroxide as the catalyst .The effect of the polymerization temperature and duration , the ratio of raw materials on the reaction of the monomers were investigated .The results showed that the temperature and dura-tion had no significant effect on the conversion rate of the D 4 but they had strong impact on the conversion rate of 1, 3-divinyltetramethylsiloxane .The conversion rate of divinyltetramethylsiloxane increased from 54.62%to 86.73%with the temperature rising from 130 ℃to 150 ℃.The conversion rate of divinyltetramethylsilox-ane increased from 52.87%to 86.02%as the polymerization time was extended from 3 hours to 6 hours.The optimal polymerization conditions were 6 hours at 150 °C.The rheology characterization of the vinyl-ended polydimethylsiloxane was tested by a digital rotational viscometer .The vinyl-ended polydimethylsiloxane was a dilatant fluid and its rheology characterization matched with the general formula ηα=Kr n-1 .