Engvangin Nge PTFE Tape hian High-Temperature Environment-ah Failure awm lovin a Adhesion a vawng reng thei?

Jiangsu Aokai New Materials siam PTFE high-temperature tape hian silicone pressure-sensitive adhesive a hmang a, 250°C-ah hun rei tak chhung chu stab takin hna a thawk thei a ni. A chhan bulpui ber chu a hnuaia thu pathumte hi a ni:

1. Main Chain hi Si–O Bonds atanga siam niin Thermal Decomposition Temperature sang tak nei a ni

PTFE high-temperature tape-a silicone pressure-sensitive adhesive molecular main chain hian Si O Si O structure a nei a. Si–O bond-a bond energy hi 445 kJ/mol vel a ni a, hei hi organic polymer pangngai, acrylates leh rubber-a C–C bond (348 kJ/mol vel) emaw C–H bond (413 kJ/mol vel) emaw aiin a sang zawk hle.

Temperature sang takah chuan C–C bonds te hi awlsam takin a chhe thei a, chain degradation a tichhuak a, Si–O bonds erawh chu a rupture theih nan energy sang zawk a mamawh thung. Chuvangin, silicone PSA molecular main chain chu 250°C-ah a awm reng a, thermal-oxidative degradation avanga adhesion loss a awm loh nan.

2. Chemical Cross-Linking Network hian Temperature sang takah Softening leh Flow a veng thei

Uncrosslinked silicone rubber hi temperature sang takah chuan viscous liquid ah a chang a, cohesive strength a hloh vek bawk. Mahse, PTFE high-temperature tape-a silicone PSA chu peroxide crosslinking emaw platinum-catalyzed addition crosslinking hmangin crosslink a ni a, linear molecular chain-te chu stable three-dimensional network-ah a thlunzawm a ni.

He crosslinked structure hian adhesive layer chu 250°C-ah solid elastic behavior a vawng reng thei a, thermoplastic material angin a hmin emaw, a luang lo emaw a ni. Modulus tlahniam tlem pawh nise, peeling do thei tur khawpa cohesive strength a la nei reng a ni.

3. Glass inthlak danglamna temperature hniam (Tg ~ −120°C) .

PTFE high-temperature tape-a silicone PSA hian Tg a nei hniam hle (−120°C vel) a nei a, chu chu a molecular chain-te chu brittle glassy state aiin, −70°C atanga 300°C thlenga temperature zau takah elastic state sang takah a awm reng tihna a ni.

Chutiang chuan temperature sang takah chuan adhesive layer chu wetting ability hloh turin a khauh lo va, flow tam lutuk thlengin a soft lo bawk. Modulus hniam tak (storage modulus G’ ≈ 104–106 Pa) a vawng reng a, hei hi pressure-sensitive adhesion atana window tha ber a ni.

Silicone PSA ngei pawh hian surface energy hniam (22 mN/m vel) a nei a, hei hian PTFE leh silicone rubber ang chi low-surface-energy substrate te chu temperature sang takah pawh a hnim tha thei a ni — surface energy matching tha lo avanga debonding awm chu a veng thei a ni.

A chunga kan tarlan te hi Jiangsu Aokai New Materials Technology Co., Ltd.

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