{"id":24080,"date":"2021-12-27T11:52:55","date_gmt":"2021-12-27T03:52:55","guid":{"rendered":"https:\/\/www.paiqinano.com\/?p=24080"},"modified":"2021-12-25T16:01:45","modified_gmt":"2021-12-25T08:01:45","slug":"%e6%b4%be%e7%91%9e%e6%9e%97%e6%97%a5%e8%ae%b0are-parylene-noodles-a-defect","status":"publish","type":"post","link":"https:\/\/www.paiqinano.com\/?p=24080","title":{"rendered":"[\u6d3e\u745e\u6797\u65e5\u8bb0]Are Parylene Noodles a Defect"},"content":{"rendered":"

Are Parylene Noodles a Defect<\/p>\n

Unlike liquid conformal coatings joined to substrate surfaces by wet application methods, polymeric parylene (XY) uses a unique chemical vapor deposition (CVD) process to assure adherence.\u00a0 There is no intermediate liquid phase.\u00a0 Rather,\u00a0cross-link polymerization of powdered raw XY-dimer\u00a0converts the solid to a vapor at the molecular level, polymerizing XY directly as a transparent film on assembly surfaces.<\/p>\n

Applied in a gaseous state, XY penetrates deep within substrate surfaces, providing an authentically conformal protective covering.\u00a0 In many ways, parylene coatings are superior to those provided by wet materials like acrylic, epoxy, silicone or urethane, for a wider variety of products and purposes.\u00a0 Micro-thin film performance makes parylene especially useful for coating printed circuit boards (PCBs) and in microelectromechanical systems (MEMs)\/nano technologies.<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0The\u00a0XY\u00a0deposition\u00a0process assures neither heat nor cooling is needed for coating adherence.\u00a0 The circuit board neither expands nor shrinks, reducing coating-stress. \u00a0Depositing XY as a dry vapor helps the coated items endure minimal changes during the application process, eliminating another major risk factor of coating defect.<\/p>\n

Polymeric Noodles<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 As a polymer, parylene begins as a monomer-based linear chain fused covalently.\u00a0 The ongoing chain\u00a0entanglements\u00a0characterizing parylene morphology stimulate a degree of viscoelastic behavior.\u00a0 Viewed microscopically under normal conditions, they resemble noodles, sometimes elongated but neither precisely straight nor clustered together; often\u00a0compared to a bundle of spaghetti noodles, they are held together by a few chemical cross-links.\u00a0\u00a0More precisely,<\/p>\n

\"1543498747(1).jpg\"<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 the shape of a Gaussian coil develops,<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 collected as parylene (or other polymer) molecules join,<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ranging from several nanometers to several tens-of-nanometers in length,<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 measured by the root-mean-square end-to-end distance Ree,<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 scaled as the square root of the coil\u2018s total number of monomers (N) or molecular weight (Mw).<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 In this basic form, which encompasses parylene morphology, noodles are\u00a0NOT\u00a0a defect, but a normal and characteristic part of the polymer\u2019s physical structure. \u00a0Increasing their density across the strands provides shape and strength, limiting their ability to pull away from each other, while increasing their functional and load-bearing uses.\u00a0 These capacities help XY polymers achieve architectural\/performance networks necessary for conformal coating purposes.<\/p>\n

Defective Noodling<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Despite its general superiority as a conformal coating, parylene application and use can suffer defects. \u00a0While common XY defects can often be identified, planned for and mitigated through proper procedures, they still occur.\u00a0\u00a0Inadequate application or deposition onto a surface unprepared for adhesion\u00a0can compromise XY function.<\/p>\n

Defective noodling is the result of deformation mechanisms developing on the surfaces and interfaces of parylene coated systems. \u00a0These factors can cause loss of the parylene film\u2019s surface pattern-effectiveness, disrupting the structural integrity of the coating\u2019s typically reliable\u00a0noodle-like\u00a0entanglement.\u00a0 The surface is then characterized by highly disordered structural configuration, resembling a plate of noodles winding chaotically around each other, interfering with parylene\u2019s usual uniform, pinhole-free surfaces.\u00a0 Disruption of the\u00a0coating\u2019s performance integrity\u00a0can lead to both current leakage and voltage breakdown.<\/p>\n

If inappropriately cleaned before application, or inadequately deposited, liquids or other substances can penetrate both at the\u00a0parylene-substrate interface and through the polymer layer, stimulating an environment of disrupted noodle development.\u00a0 Film instabilities can also occur on parylene surfaces when temperatures exceed the polymer\u2019s standard glass transition temperatures (Tg).\u00a0 Basic outcomes include sequential disruption of hierarchical coating formation, a condition that can be generated despite the protection usually afforded by XY\u2019s reliable CVD application method.\u00a0 Poor adhesion and residual stress can also lead to\u00a0bending, cracking, peeling and noodling\u00a0of parylene conformal films.<\/p>\n

Parylene conformal coating defects can be caused by a range of factors. However,<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cleanliness of the product surface,<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 carefully matching the parylene type to the coating assignment\/purpose, and<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 expert performance of the CVD process<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 mitigate the potential for these problems to arise.<\/p>\n

Undetected trace contaminants disrupt the bond between parylene film and underlying surfaces, leading to disruption of noodle configuration.<\/p>\n

Thus, noodles,\u00a0a basic element of parylene morphology, can themselves be transformed from a tasty dish of conformal coating to one that may need to be scrapped or redone.<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Conventional, non-defective parylene noodles resemble a properly cooked and stirred pot of spaghetti, with a bit of olive oil stirred in, to keep them from only adhering to each other.<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Rather, they adhere to the substrate. This recipe can be delicious!!<\/p>\n

\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 When defects occur, the noodles resemble a tangled mat of unstirred, cooked spaghetti, assuming a random shape, of little use to the conformal coating project.<\/p>\n

Not always immediately apparent, disordered adhesion will eventually compromise the coating and, ultimately, the end-product, thus neutralizing parylene\u2019s protective benefits.\u00a0 As an integral structural XY-component, you can\u2019t avoid the presence of parylene noodles, but you can control them.<\/p>\n

\u8bd1\u00a0 \u6587<\/p>\n

\n

\u00a0 \u00a0 \u00a0 \u4e0e\u6839\u636e\u6e7f\u6d82\u6cd5\u8054\u63a5\u5230\u677f\u6750\u8868\u5c42\u7684\u6db2\u6001\u4fdd\u5f62\u5efa\u7b51\u6d82\u6599\u4e0d\u4e00\u6837\uff0c\u9ad8\u805a\u7269\u805a\u5bf9\u4e8c\u7532\u82ef\uff08XY\uff09\u5e94\u7528\u4e0e\u4f17\u4e0d\u540c\u7684\u5316\u5b66\u6c14\u76f8\u6c89\u79ef\uff08CVD\uff09\u52a0\u5de5\u5de5\u827a\u6765\u4fdd\u8bc1\u9ecf\u9644\u3002\u6c92\u6709\u6b63\u4e2d\u95f4\u9ad8\u6548\u6db2\u76f8\u3002\u53cd\u8fc7\u6765\uff0c\u00a0\u00a0\u7c89\u72b6\u521d\u59cbXY-\u4e8c\u805a\u4f53\u7684\u5316\u5b66\u4ea4\u8054\u6c47\u805a\u00a0\u00a0\u5c06\u56fa\u6001\u8f6c\u6362\u4e3a\u5206\u5b50\u7ed3\u6784\u80fd\u529b\u7684\u84b8\u6c7d\uff0c\u7acb\u5373\u6c47\u805aXY\u505a\u4e3a\u62fc\u88c5\u8868\u5c42\u4e0a\u7684\u4fdd\u62a4\u819c\u3002<\/p>\n

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\u6c47\u805a\u9c9c\u9762\u6761<\/p>\n

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\"1543498747\uff081\uff09.JPG\"<\/p>\n

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Noodling\u7f3a\u9677<\/p>\n

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 <\/p>\n

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\"\"<\/p>\n

\n

 <\/p>\n

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