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              硅烷改性聚氨酯密封膠增塑劑含量對體系分子間相互作用的影響

              • 發布時間 : 2024-9-28 17:55:16
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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.

              硅烷改性聚氨酯密封膠增塑劑含量對體系分子間相互作用的影響

              (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.

              • 發布時間 : 2024-9-28 17:55:16
              • Views:
              Information

                     范德華力作用能近似等于總相互作用能,這也驗證了分子間的主要相互作用方式為范德華力作用。此外,硅烷改性聚氨酯密封膠與增塑劑白油、甲基硅油、雙端乙烯基硅油分子間的總相互作用能和范德華力作用能的增長趨勢一致,均隨著溫度的升高而減弱。因此,這在一定程度上導致了增塑劑分子隨著溫度升高而擴散能力增強。然而,對比不同增塑劑的相互作用力能發現,白油與硅烷改性聚氨酯密封膠分子間的相互作用力能大于甲基硅油和雙端乙烯基硅油,這與3種增塑劑的擴散能力不符,說明在硅烷改性聚氨酯密封膠體系中增塑劑與硅烷改性聚氨酯密封膠分子間相互作用力能并非是影響增塑劑擴散的主要因素。

                     3種混合體系中增塑劑白油、甲基硅油和雙端乙烯基硅油在不同含量下與硅烷改性聚氨酯密封膠分子間總相互作用能和范德華力作用能,如圖12和圖13所示。

                     由圖12和圖13可知:硅烷改性聚氨酯密封膠與增塑劑白油、甲基硅油、雙端乙烯基硅油分子間的總相互作用能和范德華力作用能均隨著增塑劑含量的增加而增大,增塑劑含量越高,與硅烷改性聚氨酯密封膠分子間的相互作用就越大。體系的自由體積及自由體積分數—空間效應增塑劑分子占有體積有研究表明!sod:分子的尺寸大小也會影響增塑劑的擴散性能,分子越小越容易在體系中運動。由增塑劑分子結構式可以大概看出,白油分子結構尺寸是最小的,雙端乙烯基硅油分子尺寸最大,甲基硅油次之。此外,為保證猜測的準確性,本文進一步計算了白油、甲基硅油和雙端乙烯基硅油分子在混合體系中的占有體積,計算結果如表4所示。由表4可知:增塑劑分子占有體積大小順序為,雙端乙烯基硅油>甲基硅油>白油,這也驗證了猜測結果。http://www.caffertyclinic.com/

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