对MS密封胶之FT-IR曲线的影响

发布时间 : 2025-3-20 12:25:52
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

对MS密封胶之FT-IR曲线的影响

(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

发布时间 : 2025-3-20 12:25:52
Views:

可知:PBA和MS密封胶的分子结构相似，PBA-2000比MS密封胶-2000更柔顺，但由前者制成的MS密封胶的粘接强度更高(这是由于前者具有良好的结晶性所致);与PBA和MS密封胶相比，PTMG具有更低的T(玻璃化转变温度)，并且其不能结晶，故相应MS密封胶的软化点和粘接强度均相对较低。不同多元醇质量比对MS密封胶性能的影响为进一步降低MS密封胶的熔融温度，并获得较好的力学性能，本研究以分子链柔韧性较好的脂肪族聚醋型多元醇(PBA)为主体软段(通过软段的适度结晶来改善MS密封胶的粘接性能)，并采用不同类型的多元醇(如聚醋型、聚醚型等)共混法来达到破坏软段的规整性、降低分子的内聚能、减小分子间的作用力和降低熔点等目的(为保持良好的粘接强度，可引人主链含苯环等刚性基团的聚醋多元醇)。在其他条件保持不变的前提下(如以MDI链段为硬段、混合六醇为软段等)，含不同。(PBA):m(PTMG):m(2502A)比例的MS密封胶之FT-IR曲线、SPM照片、DSC曲线、PLM照片、熔点及粘接强度等分别如图2、图3,图4、图5和表2所示。

由图2可知:与曲线a相比，曲线b在3336cm附近的氨基吸收峰略有增强且向低波数方向偏移，说明氨基形成的缔合氢键增多，N-H的氢键化有所增强;1730cm附近游离一C=0的吸收峰强度减弱，1173cm附近C-O-C的吸收峰强度增强，说明PU中氨基与一C=0缔合形成氢键(即硬段间形成氢键)的数量增加，硬段中氨基与软段中醚键缔合形成氢键的数量减少，而硬段间的氢键有利于提高软段和硬段的微相分离程度。曲线c在I730cm附近的吸收峰强度略有减弱，说明软段和硬段的微相分离程度进一步增加。http://www.sdyuantai.com/

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