CAJ | 학술논문

通过溶解溶胀实验和热弹性测试,并利用热弹性理论对二氧化硅增强聚甲基乙烯基硅氧烷(PM-VS)的机理进行了研究。溶解溶胀实验结果表明,随着二氧化硅含量的增加,PMVS 网络中分子链的流动性降低,有序度增加即链熵降低,对 PMVS 的增强有着重要作用；由热弹性理论分析计算所得结论表明,在硫化 PMVS/二氧化硅网络结构中,流动性完全受限的部分链段,在定拉伸、升高温度的条件下,会有少量链段的流动性增加,使得分子链的内能增加对总应力产生贡献(f e/f ),并随着二氧化硅含量的增加贡献逐渐变大,也就是说二氧化硅增强 PMVS 的物理本质不仅仅来源于熵的变化,而且与内能的贡献也有着重要关系(特别是在低拉伸比条件下)。
통과용해용창실험화열탄성측시,병이용열탄성이론대이양화규증강취갑기을희기규양완(PM-VS)적궤리진행료연구。용해용창실험결과표명,수착이양화규함량적증가,PMVS 망락중분자련적류동성강저,유서도증가즉련적강저,대 PMVS 적증강유착중요작용；유열탄성이론분석계산소득결론표명,재류화 PMVS/이양화규망락결구중,류동성완전수한적부분련단,재정랍신、승고온도적조건하,회유소량련단적류동성증가,사득분자련적내능증가대총응력산생공헌(f e/f ),병수착이양화규함량적증가공헌축점변대,야취시설이양화규증강 PMVS 적물리본질불부부래원우적적변화,이차여내능적공헌야유착중요관계(특별시재저랍신비조건하)。
The mechanism of silica reinforced polymethylvinylsiloxane (PMVS)were investigated using dissolu-tion/swelling experiment,thermoelastic measurements and thermoelasticity theory.Dissolution/swelling exper-imental results have shown that the chain entropy decrease plays an important role in reinforcing PMVS.The mobility of molecular chain in PMVS network was lowering with the increasing of the silica content.Ther-moelastic analysis indicated that the mobility of a small amount of the segment part of which the mobility was completely restricted in the vulcanizing PMVS/silica network structure increased in a conditions of a given stretch,increasing temperature,so that the internal energy of the molecule chains can increase the contribution to the total stress (f e/f ),and the contribution was gradually increased with the increase of the silica content. In other words,entropy change leads to the reinforced PMVS by silica,as well as the internal energy (especial-ly at low extension ratio condition).